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id="topmainbannertablet"></div> <div id="topmainbannerphone"></div> <div class="mindatadiv"><script src="/web/20161210045251js_/http://www.mindat.org/show.js" language="JavaScript" type="text/javascript"> </script> <div class="fpbox990nl"><h1>Bertrandite</h1><div id="sponsorship"><b>This page is currently not sponsored. <a href="/web/20161210045251/http://www.mindat.org/sponsor.php?min=642">Click here to sponsor this page.</a></b></div><div id="ndminmenu"><a id="gallerymenu2ctrl" href="javascript:openexpander('gallerymenu','2');">Photos of Bertrandite (425)</a><div class="clearer"></div></div> <div class="expandmenu2" id="gallerymenu"> <a href="/web/20161210045251/http://www.mindat.org/gm/642">Bertrandite Gallery</a><a href="/web/20161210045251/http://www.mindat.org/gallery.php?min=642">Search Photos of Bertrandite</a></div> <div class="expandmenu2" id="mineditmenu"> <a href="/web/20161210045251/http://www.mindat.org/mineraledit.php?id=642">Edit </a><a href="/web/20161210045251/http://www.mindat.org/mineraledit.php?ee=642">Add Synonym</a><a href="/web/20161210045251/http://www.mindat.org/show.php?id=642&ld=&clearcache=1">Clear Cache</a><a href="//web.archive.org/web/20161210045251/http://mesg-63-0.html/">Edit 'Best-of' Discussion</a></div> <div id="expanderarea2"></div> <div class="minpagephotobox hidephone hidetablet"><div class="newpicbox "><div class="userbigpicture noborder" style="float: left; width: 386px;"><a href="/web/20161210045251/http://www.mindat.org/photo-19583.html"><img width="386" height="289" src="/web/20161210045251im_/http://www.mindat.org/arphotos/386h289-0102138001091757828.jpg"></a><div class="userbigpicturecomment"><b><a href="/web/20161210045251/http://www.mindat.org/min-642.html">Bertrandite</a></b><br><br><a href="/web/20161210045251/http://www.mindat.org/loc-3280.html">Foote Lithium Co. Mine, Kings Mountain District, Cleveland Co., North Carolina, USA</a></div></div><div class="userbigpicture noborder" style="float: left; width: 221px;"><a href="/web/20161210045251/http://www.mindat.org/photo-38545.html"><img width="221" height="289" src="/web/20161210045251im_/http://www.mindat.org/arphotos/221h289-0813281001127409737.jpg"></a><div class="userbigpicturecomment"><b><a href="/web/20161210045251/http://www.mindat.org/min-642.html">Bertrandite</a></b><br><br><a href="/web/20161210045251/http://www.mindat.org/loc-4513.html">Golconda pegmatite, Golconda district, Governador Valadares, Doce valley, Minas Gerais, Brazil</a></div></div><div class="userbigpicture noborder" style="float: left; width: 386px;"><a href="/web/20161210045251/http://www.mindat.org/photo-558661.html"><img width="386" height="289" src="/web/20161210045251im_/http://www.mindat.org/arphotos/386h289-0571891001378827486.jpg"></a><div class="userbigpicturecomment"><b><a href="/web/20161210045251/http://www.mindat.org/min-642.html">Bertrandite</a></b><br><br><a href="/web/20161210045251/http://www.mindat.org/loc-10487.html">Cuasso al Monte, Ceresio Valley, Varese Province, Lombardy, Italy</a></div></div><div class="clearer"></div></div></div><div class="minpagephotobox hidephone hidepc"><div class="newpicbox "><div class="userbigpicture noborder" style="float: left; width: 261px;"><a href="/web/20161210045251/http://www.mindat.org/photo-19583.html"><img width="261" height="196" src="/web/20161210045251im_/http://www.mindat.org/arphotos/386h289-0102138001091757828.jpg"></a><div class="userbigpicturecomment"><b><a href="/web/20161210045251/http://www.mindat.org/min-642.html">Bertrandite</a></b><br><br><a href="/web/20161210045251/http://www.mindat.org/loc-3280.html">Foote Lithium Co. Mine, Kings Mountain District, Cleveland Co., North Carolina, USA</a></div></div><div class="userbigpicture noborder" style="float: left; width: 150px;"><a href="/web/20161210045251/http://www.mindat.org/photo-38545.html"><img width="150" height="196" src="/web/20161210045251im_/http://www.mindat.org/arphotos/221h289-0813281001127409737.jpg"></a><div class="userbigpicturecomment"><b><a href="/web/20161210045251/http://www.mindat.org/min-642.html">Bertrandite</a></b><br><br><a href="/web/20161210045251/http://www.mindat.org/loc-4513.html">Golconda pegmatite, Golconda district, Governador Valadares, Doce valley, Minas Gerais, Brazil</a></div></div><div class="userbigpicture noborder" style="float: left; width: 261px;"><a href="/web/20161210045251/http://www.mindat.org/photo-558661.html"><img width="261" height="196" src="/web/20161210045251im_/http://www.mindat.org/arphotos/386h289-0571891001378827486.jpg"></a><div class="userbigpicturecomment"><b><a href="/web/20161210045251/http://www.mindat.org/min-642.html">Bertrandite</a></b><br><br><a href="/web/20161210045251/http://www.mindat.org/loc-10487.html">Cuasso al Monte, Ceresio Valley, Varese Province, Lombardy, Italy</a></div></div><div class="clearer"></div></div></div><div class="minpagephotobox hidetablet hidepc"><div class="newpicbox "><div class="userbigpicture noborder" style="float: left; width: 316px;"><a href="/web/20161210045251/http://www.mindat.org/photo-19583.html"><img width="316" src="/web/20161210045251im_/http://www.mindat.org/arphotos/386h289-0102138001091757828.jpg"></a><div class="userbigpicturecomment"><b><a href="/web/20161210045251/http://www.mindat.org/min-642.html">Bertrandite</a></b><br><br><a href="/web/20161210045251/http://www.mindat.org/loc-3280.html">Foote Lithium Co. Mine, Kings Mountain District, Cleveland Co., North Carolina, USA</a></div></div><div class="userbigpicture noborder" style="float: left; width: 316px;"><a href="/web/20161210045251/http://www.mindat.org/photo-38545.html"><img width="316" src="/web/20161210045251im_/http://www.mindat.org/arphotos/316-0813281001127409737.jpg"></a><div class="userbigpicturecomment"><b><a href="/web/20161210045251/http://www.mindat.org/min-642.html">Bertrandite</a></b><br><br><a href="/web/20161210045251/http://www.mindat.org/loc-4513.html">Golconda pegmatite, Golconda district, Governador Valadares, Doce valley, Minas Gerais, Brazil</a></div></div><div class="clearer"></div></div></div><div><div id="introdata"><div><span>Formula:</span><div class="twocol"><span class="newformula">Be<sub class="newformsub">4</sub>(Si<sub class="newformsub">2</sub>O<sub class="newformsub">7</sub>)(OH)<sup class="newformsup newformabs"></sup><sub class="newformsub">2</sub></span></div></div><div><span>System:</span><div>Orthorhombic</div></div><div><span>Colour:</span><div>Colourless, pale yellow.</div></div><div><span>Lustre:</span><div>Vitreous</div></div><div><span>Hardness:</span><div>6 - 7</div></div><div><span>Name:</span><div class="twocol">For Emile Bertrand (1844-1909), French mineralogist.</div></div></div></div><div class="clearer"></div><div class="padder4"><br><br><b>Visit gemdat.org for <a href="https://web.archive.org/web/20161210045251/http://www.gemdat.org/gem-642.html">gemological information about Bertrandite</a>.</b><br/><br/><br/></div><h2 class="mindatadivh2">Classification of Bertrandite</h2><div class="mindatarow"><div class="mindatath"><a href="/web/20161210045251/http://www.mindat.org/glossary/IMA_status">IMA status:</a></div><div class="mindatam2">Approved, 'Grandfathered' (first described prior to 1959)</div></div><div class="mindatarow"><div class="mindatath"><a href="strunz8.php">Strunz 8th ed.:</a></div><div class="mindatam2">8/C.07-10<br></div></div><div class="mindatarow"><div class="mindatath"><a href="strunz.php">Nickel-Strunz 10th (pending) ed.:</a></div><div class="mindatam2">9.BD.05<br><br>9 : SILICATES (Germanates)<br>B : Sorosilicates<br>D : Si<sub>2</sub>O<sub>7</sub> groups, with additional anions; cations in tetrahedral [4] and greater coordination</div></div><div class="mindatarow"><div class="mindatath"><a href="dana.php">Dana 8th ed.:</a></div><div class="mindatam2">56.1.1.1<br><br>56 : SOROSILICATES Si<sub>2</sub>O<sub>7</sub> Groups, With Additional O, OH, F and H<sub>2</sub>O<br>1 : Si<sub>2</sub>O<sub>7</sub> Groups and O, OH, F, and H<sub>2</sub>O with cations in [4] coordination</div></div><div class="mindatarow"><div class="mindatath"><a href="cim.php">Hey's CIM Ref.:</a></div><div class="mindatam2">14.3.2<br><br>14 : Silicates not Containing Aluminum<br>3 : Silicates of Be</div></div><script> $(function() { $("div.tree li:last-child").addClass("lasttree"); }); </script> <h2 class="mindatadivh2">Occurrences of Bertrandite</h2><h2 class="mindatadivh2">Type Occurrence of Bertrandite</h2><div class="mindatarow"><div class="mindatath">Co-type Localities:</div><div class="mindatam2"><a href="loc-4401.html">Barbin Quarry, Nantes, Loire-Atlantique, Pays de Loire, France</a><br><a href="loc-4400.html">Petit-Port, Nantes, Loire-Atlantique, Pays de Loire, France</a></div></div><div class="mindatarow"><div class="mindatath">Place of Conservation of Type Material:</div><div class="mindatam2">National School of Mines, Paris, France</div></div><h2 class="mindatadivh2">Physical Properties of Bertrandite</h2><div class="mindatarow"><div class="mindatath"><a href="/web/20161210045251/http://www.mindat.org/glossary/lustre">Lustre:</a></div><div class="mindatam2">Vitreous</div></div><div class="mindatarow"><div class="mindatath">Diaphaneity (Transparency):</div><div class="mindatam2">Transparent</div></div><div class="mindatarow"><div class="mindatath">Comment:</div><div class="mindatam2">Pearly on cleavage {001}</div></div><div class="mindatarow"><div class="mindatath">Colour:</div><div class="mindatam2">Colourless, pale yellow.</div></div><div class="mindatarow"><div class="mindatath">Hardness (Mohs):</div><div class="mindatam2">6 - 7</div></div><div class="mindatarow"><div class="mindatath">Cleavage:</div><div class="mindatam2">Perfect<br>Perfect on {001}<br/> Distinct on {100}, {010} and {110}</div></div><div class="mindatarow"><div class="mindatath">Density:</div><div class="mindatam2">2.59 - 2.6 g/cm<sup>3</sup> (Measured)    2.61 g/cm<sup>3</sup> (Calculated)</div></div><h2 class="mindatadivh2">Crystallography of Bertrandite</h2><div class="mindatarow"><div class="mindatath">Crystal System:</div><div class="mindatam2">Orthorhombic</div></div><div class="mindatarow"><div class="mindatath">Class (H-M):</div><div class="mindatam2"><i>m</i><i>m</i>2 - Pyramidal</div></div><div class="mindatarow"><div class="mindatath">Space Group:</div><div class="mindatam2"><i>C</i><i>m</i><i>c</i>2<sub>1</sub></div></div><div class="mindatarow"><div class="mindatath">Cell Parameters:</div><div class="mindatam2">a = 8.7135(4) Å, b = 15.268(1) Å, c = 4.5683(3) Å<br></div></div><div class="mindatarow"><div class="mindatath">Ratio:</div><div class="mindatam2">a:b:c = 0.571 : 1 : 0.299</div></div><div class="mindatarow"><div class="mindatath">Unit Cell Volume:</div><div class="mindatam2">V 607.76 Å³ (Calculated from Unit Cell)</div></div><div class="mindatarow"><div class="mindatath">Z:</div><div class="mindatam2">4</div></div><div class="mindatarow"><div class="mindatath">Morphology:</div><div class="mindatam2">Thin tabular, prismatic to needle-like</div></div><div class="mindatarow"><div class="mindatath">Twinning:</div><div class="mindatam2">Common on {011}, {021}; heart- or V-shaped twins.</div></div><h2 class="mindatadivh2">Crystallographic forms of Bertrandite</h2><div class="mindatarow"><div class="mindatath">Crystal Atlas:</div><div class="mindatam2"><div id="xtlbox"> <div id="xtlboximage"> <div id="waitxtl">Image Loading</div> <img id="xtlboximagefile" src="/web/20161210045251im_/http://www.mindat.org/min-642.html" onload="msghide('waitxtl');"> </div> <div id="xtlbox3d"> <script src="/web/20161210045251js_/http://www.mindat.org/js/jsc3d.js"></script> <script src="/web/20161210045251js_/http://www.mindat.org/js/smorf3d.js"></script> <canvas id="cv" style="float:left; " width="350" height="350"></canvas> <script> var canvas = document.getElementById('cv'); var smorf = new Smorf(canvas); smorf.setParameter('backgroundcolor', '#ffffff'); smorf.setParameter('axes', false); smorf.setParameter('rotation', '-20'); smorf.setParameter('filename', 'Bertrandite_19.smorf.bin'); smorf.setParameter('files_directory', '__crystals'); smorf.setParameter('definition', 'high'); smorf.init(); </script></div> </div> <div class="xtlscroll"> <b>Click on an icon to view</b><br> <div class="xtlscrollline"><div class="xtlscroll2d"> </div><div class="xtlscroll3d"> <a href="javascript:;" onclick="swapcrystal('Bertrandite_19', 'smorf', 'Tabular {001}<br />Locality: Pisek, Bohemia, Czech Republic<br />Vrba, 1889/1888. In: V.M. Goldschmidt, Atlas der Krystallformen, 1913-1923 (\'Bertrandit\').');"><img src="/web/20161210045251im_/http://www.mindat.org/images/3d.gif"></a> </div> <div class="xtlname"> Bertrandite no.19 - Goldschmidt (1913-1926)</div></div> <div class="xtlscrollline"><div class="xtlscroll2d"> </div><div class="xtlscroll3d"> <a href="javascript:;" onclick="swapcrystal('Bertrandite_20', 'smorf', 'Tabular {001}<br />Locality: Pisek, Bohemia, Czech Republic<br />Vrba, 1889/1888. In: V.M. Goldschmidt, Atlas der Krystallformen, 1913-1923 (\'Bertrandit\').');"><img src="/web/20161210045251im_/http://www.mindat.org/images/3d.gif"></a> </div> <div class="xtlname"> Bertrandite no.20 - Goldschmidt (1913-1926)</div></div> <div class="xtlscrollline"><div class="xtlscroll2d"> </div><div class="xtlscroll3d"> <a href="javascript:;" onclick="swapcrystal('Bertrandite_21', 'smorf', 'Contact twin on {021}<br />Locality: Pisek, Bohemia, Czech Republic<br />Vrba, 1889. In: V.M. Goldschmidt, Atlas der Krystallformen, 1913-1923 (\'Bertrandit\').');"><img src="/web/20161210045251im_/http://www.mindat.org/images/3d.gif"></a> </div> <div class="xtlname"> Bertrandite no.21 - Goldschmidt (1913-1926)</div></div> </div> <div id="xtlinfo"> </div> <div id="xtlabout"> 3d models and HTML5 code kindly provided by <a target="_blank" href="/web/20161210045251/http://www.mindat.org/click.php?enc=aHR0cDovL3d3dy5zbW9yZi5ubA%3D%3D">www.smorf.nl</a>.<br><br> <b>Toggle</b><br> <span class="clicky" onclick="javascript:smorf.toggleLines();">Edge Lines</span> | <span class="clicky" onclick="javascript:smorf.toggleMillers();">Miller Indicies</span> | <span class="clicky" onclick="javascript:smorf.toggleAxes();">Axes</span> <br><br> <b>Transparency</b><br> <span class="clicky" onclick="javascript:smorf.setTransparency(0);">Opaque</span> | <span class="clicky" onclick="javascript:smorf.setTransparency(0.5);">Translucent</span> | <span class="clicky" onclick="javascript:smorf.setTransparency(1);">Transparent</span> <br><br> <b>View</b><br> <span class="clicky" onclick="javascript:smorf.viewAlongAxis('a');">Along a-axis</span> | <span class="clicky" onclick="javascript:smorf.viewAlongAxis('b');">Along b-axis</span> | <span class="clicky" onclick="javascript:smorf.viewAlongAxis('c');">Along c-axis</span> | <span class="clicky" onclick="javascript:smorf.autoRotate(-2, 100);">Start rotation</span> | <span class="clicky" onclick="javascript:smorf.stopAutoRotate();">Stop rotation</span> </div> <script type="text/javascript"> swapcrystal('Bertrandite_19','smorf',"Tabular {001}<br />Locality: Pisek, Bohemia, Czech Republic<br />Vrba, 1889/1888. In: V.M. Goldschmidt, Atlas der Krystallformen, 1913-1923 (\'Bertrandit\')."); </script> </div></div><h2 class="mindatadivh2">Optical Data of Bertrandite</h2><div class="mindatarow"><div class="mindatath">Type:</div><div class="mindatam2">Biaxial (-)</div></div><div class="mindatarow"><div class="mindatath">RI values:</div><div class="mindatam2"> <i>n</i><sub>α</sub> = 1.591 <i>n</i><sub>β</sub> = 1.605 <i>n</i><sub>γ</sub> = 1.614</div></div><div class="mindatarow"><div class="mindatath">2V:</div><div class="mindatam2">Measured: 73° to 81°, Calculated: 76° </div></div><div class="mindatarow"><div class="mindatath">Max Birefringence:</div><div class="mindatam2">δ = 0.023<br><div id="birefnote">Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.</div><img src="/web/20161210045251im_/http://www.mindat.org/levy.php?rate=0.023"></div></div><div class="mindatarow"><div class="mindatath">Surface Relief:</div><div class="mindatam2">Moderate</div></div><div class="mindatarow"><div class="mindatath">Dispersion:</div><div class="mindatam2">r < v weak</div></div><h2 class="mindatadivh2">Chemical Properties of Bertrandite</h2><div class="mindatarow"><div class="mindatath">Formula:</div><div class="mindatam2"><span class="newformula">Be<sub class="newformsub">4</sub>(Si<sub class="newformsub">2</sub>O<sub class="newformsub">7</sub>)(OH)<sup class="newformsup newformabs"></sup><sub class="newformsub">2</sub></span></div></div><div class="mindatarow"><div class="mindatath">All elements listed in formula:</div><div class="mindatam2"><a href="/web/20161210045251/http://www.mindat.org/element/Beryllium">Be</a>, <a href="/web/20161210045251/http://www.mindat.org/element/Hydrogen">H</a>, <a href="/web/20161210045251/http://www.mindat.org/element/Oxygen">O</a>, <a href="/web/20161210045251/http://www.mindat.org/element/Silicon">Si</a> - <a href="chemsearch.php?inc=BeSiOH,">search for minerals with similar chemistry</a></div></div><div class="mindatarow"><div class="mindatath">Common Impurities:</div><div class="mindatam2">Al,Fe,Ca</div></div><h2 class="mindatadivh2">Relationship of Bertrandite to other Species</h2><div class="mindatarow"><div class="mindatath"><a href="strunz.php">Related Minerals - Nickel-Strunz Grouping):</a></div><div class="mindatam2"><table class="grouptable"><tr><td class="mw6em">9.BD.10</td><td class="mw12em"><a href="min-1860.html">Hemimorphite</a></td><td class="m"><span class="newformula">Zn<sub class="newformsub">4</sub>Si<sub class="newformsub">2</sub>O<sub class="newformsub">7</sub>(OH)<sub class="newformsub">2</sub> · H<sub class="newformsub">2</sub>O</span></td></tr><tr><td class="mw6em">9.BD.15</td><td class="mw12em"><a href="min-2123.html">Junitoite</a></td><td class="m"><span class="newformula">CaZn<sub class="newformsub">2</sub>Si<sub class="newformsub">2</sub>O<sub class="newformsub">7</sub> · H<sub class="newformsub">2</sub>O</span></td></tr><tr><td class="mw6em">9.BD.20</td><td class="mw12em"><a href="min-1459.html">Axinite-(Fe)</a></td><td class="m"><span class="newformula">Ca<sub class="newformsub">2</sub>Fe<sup class="newformsup">2+</sup>Al<sub class="newformsub">2</sub>BSi<sub class="newformsub">4</sub>O<sub class="newformsub">15</sub>OH</span></td></tr><tr><td class="mw6em">9.BD.20</td><td class="mw12em"><a href="min-2490.html">Axinite-(Mg)</a></td><td class="m"><span class="newformula">Ca<sub class="newformsub">2</sub>MgAl<sub class="newformsub">2</sub>BSi<sub class="newformsub">4</sub>O<sub class="newformsub">15</sub>OH</span></td></tr><tr><td class="mw6em">9.BD.20</td><td class="mw12em"><a href="min-2502.html">Axinite-(Mn)</a></td><td class="m"><span class="newformula">Ca<sub class="newformsub">2</sub>Mn<sup class="newformsup">2+</sup>Al<sub class="newformsub">2</sub>BSi<sub class="newformsub">4</sub>O<sub class="newformsub">15</sub>(OH)</span></td></tr><tr><td class="mw6em">9.BD.20</td><td class="mw12em"><a href="min-3972.html">Tinzenite</a></td><td class="m"><span class="newformula">Ca<sub class="newformsub">2</sub>Mn<sub class="newformsub newformsubabs">4</sub><sup class="newformsup">2+</sup>Al<sub class="newformsub">4</sub>[B<sub class="newformsub">2</sub>Si<sub class="newformsub">8</sub>O<sub class="newformsub">30</sub>](OH)<sup class="newformsup newformabs"></sup><sub class="newformsub">2</sub></span></td></tr><tr><td class="mw6em">9.BD.25</td><td class="mw12em"><a href="min-4192.html">Vistepite</a></td><td class="m"><span class="newformula">SnMn<sub class="newformsub">4</sub>B<sub class="newformsub">2</sub>Si<sub class="newformsub">4</sub>O<sub class="newformsub">16</sub>(OH)<sup class="newformsup newformabs"></sup><sub class="newformsub">2</sub></span></td></tr><tr><td class="mw6em">9.BD.30</td><td class="mw12em"><a href="min-6829.html">Boralsilite</a></td><td class="m"><span class="newformula">Al<sub class="newformsub">16</sub>B<sub class="newformsub">6</sub>Si<sub class="newformsub">2</sub>O<sup class="newformsup newformabs"></sup><sub class="newformsub">37</sub></span></td></tr><tr><td class="mw6em">9.BD.35</td><td class="mw12em"><a href="min-4270.html">Werdingite</a></td><td class="m"><span class="newformula">(Mg,Fe)<sub class="newformsub">2</sub>Al<sub class="newformsub">14</sub>Si<sub class="newformsub">4</sub>B<sub class="newformsub">4</sub>O<sup class="newformsup newformabs"></sup><sub class="newformsub">37</sub></span></td></tr></table></div></div><div class="mindatarow"><div class="mindatath"><a href="cim.php">Related Minerals - Hey's Index Grouping:</a></div><div class="mindatam2"><table class="grouptable"><tr><td class="mw6em">14.3.1</td><td class="mw12em"><a href="min-3188.html">Phenakite</a></td><td><span class="newformula">Be<sub class="newformsub">2</sub>SiO<sup class="newformsup newformabs"></sup><sub class="newformsub">4</sub></span></td></tr><tr><td class="mw6em">14.3.3</td><td class="mw12em"><a href="min-643.html">Beryllite</a></td><td><span class="newformula">Be<sub class="newformsub">3</sub>(SiO<sub class="newformsub">4</sub>)(OH)<sub class="newformsub">2</sub> · H<sub class="newformsub">2</sub>O</span></td></tr><tr><td class="mw6em">14.3.4</td><td class="mw12em"><a href="min-2393.html">Liberite</a></td><td><span class="newformula">Li<sub class="newformsub">2</sub>BeSiO<sup class="newformsup newformabs"></sup><sub class="newformsub">4</sub></span></td></tr><tr><td class="mw6em">14.3.5</td><td class="mw12em"><a href="min-1007.html">Chkalovite</a></td><td><span class="newformula">Na<sub class="newformsub">2</sub>BeSi<sub class="newformsub">2</sub>O<sup class="newformsup newformabs"></sup><sub class="newformsub">6</sub></span></td></tr><tr><td class="mw6em">14.3.6</td><td class="mw12em"><a href="min-1421.html">Eudidymite</a></td><td><span class="newformula">Na<sub class="newformsub">2</sub>Be<sub class="newformsub">2</sub>Si<sub class="newformsub">6</sub>O<sub class="newformsub">15</sub> · H<sub class="newformsub">2</sub>O</span></td></tr><tr><td class="mw6em">14.3.7</td><td class="mw12em"><a href="min-1388.html">Epididymite</a></td><td><span class="newformula">Na<sub class="newformsub">2</sub>Be<sub class="newformsub">2</sub>Si<sub class="newformsub">6</sub>O<sub class="newformsub">15</sub> · H<sub class="newformsub">2</sub>O</span></td></tr><tr><td class="mw6em">14.3.8</td><td class="mw12em"><a href="min-1769.html">Gugiaite</a></td><td><span class="newformula">Ca<sub class="newformsub">2</sub>Be(Si<sub class="newformsub">2</sub>O<sub class="newformsub">7</sub>)</span></td></tr><tr><td class="mw6em">14.3.9</td><td class="mw12em"><a href="min-2086.html">Jeffreyite</a></td><td><span class="newformula">(Ca,Na)<sub class="newformsub">2</sub>(Be,Al)(Si<sub class="newformsub">2</sub>O<sub class="newformsub">7</sub>,HSi<sub class="newformsub">2</sub>O<sub class="newformsub">7</sub>)</span></td></tr><tr><td class="mw6em">14.3.10</td><td class="mw12em"><a href="min-3615.html">Semenovite-(Ce)</a></td><td><span class="newformula">Na<sub class="newformsub">8</sub>Ca<sub class="newformsub">2</sub>FeBe<sub class="newformsub">6</sub>Ce<sub class="newformsub">2</sub>Si<sub class="newformsub">14</sub>O<sub class="newformsub">40</sub>(OH)<sub class="newformsub">4</sub>F<sup class="newformsup newformabs"></sup><sub class="newformsub">4</sub></span></td></tr><tr><td class="mw6em">14.3.11</td><td class="mw12em"><a href="min-545.html">Barylite</a></td><td><span class="newformula">Be<sub class="newformsub">2</sub>Ba(Si<sub class="newformsub">2</sub>O<sub class="newformsub">7</sub>)</span></td></tr><tr><td class="mw6em">14.3.12</td><td class="mw12em"><a href="min-1905.html">Hingganite-(Ce)</a></td><td><span class="newformula">(Ce,REE)<sub class="newformsub">2</sub>(□,Fe<sup class="newformsup">2+</sup>)Be<sub class="newformsub">2</sub>[SiO<sub class="newformsub">4</sub>]<sub class="newformsub">2</sub>(OH)<sup class="newformsup newformabs"></sup><sub class="newformsub">2</sub></span></td></tr><tr><td class="mw6em">14.3.13</td><td class="mw12em"><a href="min-1907.html">Hingganite-(Yb)</a></td><td><span class="newformula">(Yb,Y,REE)<sub class="newformsub">2</sub>□Be<sub class="newformsub">2</sub>[SiO<sub class="newformsub">4</sub>]<sub class="newformsub">2</sub>(OH)<sup class="newformsup newformabs"></sup><sub class="newformsub">2</sub></span></td></tr><tr><td class="mw6em">14.3.14</td><td class="mw12em"><a href="min-1906.html">Hingganite-(Y)</a></td><td><span class="newformula">(Y,REE,Ca)<sub class="newformsub">2</sub>(□,Fe<sup class="newformsup">2+</sup>)Be<sub class="newformsub">2</sub>[SiO<sub class="newformsub">4</sub>]<sub class="newformsub">2</sub>(OH)<sup class="newformsup newformabs"></sup><sub class="newformsub">2</sub></span></td></tr><tr><td class="mw6em">14.3.15</td><td class="mw12em"><a href="min-2716.html">Minasgeraisite-(Y)</a></td><td><span class="newformula">CaBe<sub class="newformsub">2</sub>Y<sub class="newformsub">2</sub>Si<sub class="newformsub">2</sub>O<sup class="newformsup newformabs"></sup><sub class="newformsub">10</sub></span></td></tr><tr><td class="mw6em">14.3.16</td><td class="mw12em"><a href="min-3716.html">Sørensenite</a></td><td><span class="newformula">Na<sub class="newformsub">4</sub>SnBe<sub class="newformsub">2</sub>Si<sub class="newformsub">6</sub>O<sub class="newformsub">16</sub>(OH)<sup class="newformsup newformabs"></sup><sub class="newformsub">4</sub></span></td></tr><tr><td class="mw6em">14.3.17</td><td class="mw12em"><a href="min-4018.html">Trimerite</a></td><td><span class="newformula">CaMn<sub class="newformsub newformsubabs">2</sub><sup class="newformsup">2+</sup>Be<sub class="newformsub">3</sub>(SiO<sub class="newformsub">4</sub>)<sup class="newformsup newformabs"></sup><sub class="newformsub">3</sub></span></td></tr><tr><td class="mw6em">14.3.18</td><td class="mw12em"><a href="min-1002.html">Chiavennite</a></td><td><span class="newformula">CaMnBe<sub class="newformsub">2</sub>Si<sub class="newformsub">5</sub>O<sub class="newformsub">13</sub>(OH)<sub class="newformsub">2</sub> · 2H<sub class="newformsub">2</sub>O</span></td></tr><tr><td class="mw6em">14.3.19</td><td class="mw12em"><a href="min-4065.html">Tvedalite</a></td><td><span class="newformula">(Ca,Mn)<sub class="newformsub">4</sub>Be<sub class="newformsub">3</sub>Si<sub class="newformsub">6</sub>O<sub class="newformsub">17</sub>(OH)<sub class="newformsub">4</sub> · 3H<sub class="newformsub">2</sub>O</span></td></tr><tr><td class="mw6em">14.3.20</td><td class="mw12em"><a href="min-1822.html">Harstigite</a></td><td><span class="newformula">Ca<sub class="newformsub">6</sub>(Mn,Mg)Be<sub class="newformsub">4</sub>Si<sub class="newformsub">6</sub>(O,OH)<sup class="newformsup newformabs"></sup><sub class="newformsub">24</sub></span></td></tr><tr><td class="mw6em">14.3.21</td><td class="mw12em"><a href="min-3839.html">Sverigeite</a></td><td><span class="newformula">NaMnMgSnBe<sub class="newformsub">2</sub>(SiO<sub class="newformsub">4</sub>)<sub class="newformsub">3</sub>(OH)</span></td></tr><tr><td class="mw6em">14.3.22</td><td class="mw12em"><a href="min-2100.html">Joesmithite</a></td><td><span class="newformula">{Pb}{Ca<sub class="newformsub">2</sub>}{Mg<sub class="newformsub">3</sub>Fe<sub class="newformsub newformsubabs">2</sub><sup class="newformsup">3+</sup>}(Be<sub class="newformsub">2</sub>Si<sub class="newformsub">6</sub>O<sub class="newformsub">22</sub>)(OH)<sup class="newformsup newformabs"></sup><sub class="newformsub">2</sub></span></td></tr><tr><td class="mw6em">14.3.23</td><td class="mw12em"><a href="min-1628.html">Gadolinite-(Y)</a></td><td><span class="newformula">Y<sub class="newformsub">2</sub>Fe<sup class="newformsup">2+</sup>Be<sub class="newformsub">2</sub>Si<sub class="newformsub">2</sub>O<sup class="newformsup newformabs"></sup><sub class="newformsub">10</sub></span></td></tr><tr><td class="mw6em">14.3.24</td><td class="mw12em"><a href="min-1627.html">Gadolinite-(Ce)</a></td><td><span class="newformula">(Ce,La,Nd,Y)<sub class="newformsub">2</sub>Fe<sup class="newformsup">2+</sup>Be<sub class="newformsub">2</sub>Si<sub class="newformsub">2</sub>O<sup class="newformsup newformabs"></sup><sub class="newformsub">10</sub></span></td></tr><tr><td class="mw6em">14.3.25</td><td class="mw12em"><a href="min-833.html">Calciogadolinite-(Y)</a></td><td><span class="newformula">(YCa)<sub class="newformsub">2</sub>Fe<sup class="newformsup">3+</sup>Be<sub class="newformsub">2</sub>[SiO<sub class="newformsub">4</sub>]<sub class="newformsub">2</sub>O<sup class="newformsup newformabs"></sup><sub class="newformsub">2</sub></span></td></tr></table></div></div><h2 class="mindatadivh2">Other Names for Bertrandite</h2><div class="mindatarow"><div class="mindatath"><a href="/web/20161210045251/http://www.mindat.org/glossary/synonym">Synonyms:</a></div><div class="mindatam2"><div class="newgrouptable2"><p><a href="min-31496.html">Hessenbergite</a></p></div></div></div><div class="mindatarow"><div class="mindatath">Name in Other Languages:</div><div class="mindatam2"><div class="newgrouptable3"><div><b>German:</b><span><a href="min-12708.html">Bertrandit</a><br><a href="min-31497.html">Hessenbergit</a></span></div><div><b>Russian:</b><span><a href="min-32967.html">Бертрандит</a></span></div><div><b>Simplified Chinese:</b><span><a href="min-41815.html">羟硅铍石</a></span></div><div><b>Spanish:</b><span><a href="min-12709.html">Bertrandita</a></span></div><div><b>Traditional Chinese:</b><span><a href="min-45219.html">羥矽鈹石</a></span></div></div></div></div><div class="mindatarow"><div class="mindatath"><a href="/web/20161210045251/http://www.mindat.org/glossary/variety">Varieties:</a></div><div class="mindatam2"><div class="newgrouptable2"><p><a href="min-10246.html">Gel-Bertrandite</a></p></div></div></div><h2 class="mindatadivh2">Other Information</h2><div class="mindatarow"><div class="mindatath">Electrical:</div><div class="mindatam2">Pyroelectric</div></div><div class="mindatarow"><div class="mindatath">Health Risks:</div><div class="mindatam2">No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.</div></div><h2 class="mindatadivh2">References for Bertrandite</h2><div class="mindatarow"><div class="mindatath">Reference List:</div><div class="mindatam2"><div id="minreflist"></div>Neues Jahrbuch für Mineralogie, Monatshefte (1992): 13-19.<br/> </div></div><h2 class="mindatadivh2">Internet Links for Bertrandite</h2><div class="mindatarow"><div class="mindatath">mindat.org URL:</div><div class="mindatam2"><a href="https://web.archive.org/web/20161210045251/http://www.mindat.org/min-642.html">http://www.mindat.org/min-642.html</a><br>Please feel free to link to this page.</div></div><div class="mindatarow"><div class="mindatath">Search Engines:</div><div class="mindatam2"> <form method="get" name="googleform" action="https://web.archive.org/web/20161210045251/http://www.google.com/custom" target="_blank"> <input type="hidden" name="q" size="31" maxlength="255" value="bertrandite"></input> <input type="hidden" name="client" value="pub-7737835674400043"></input> <input type="hidden" name="forid" value="1"></input> <input type="hidden" name="ie" value="ISO-8859-1"></input> <input type="hidden" name="oe" value="ISO-8859-1"></input> <input type="hidden" name="cof" value="GALT:#008000;GL:1;DIV:#336699;VLC:663399;AH:center;BGC:FFFFFF;LBGC:336699;ALC:0000FF;LC:0000FF;T:000000;GFNT:0000FF;GIMP:0000FF;FORID:1;"></input> <input type="hidden" name="hl" value="en"></input> </form> <li><a href="#" onclick="document.googleform.submit();">Look for Bertrandite on Google</a></li>  <li><a target="_blank" href="/web/20161210045251/http://www.mindat.org/click.php?enc=aHR0cDovL3d3dy5nb29nbGUuY29tL2ltYWdlcz9xPWJlcnRyYW5kaXRl">Look for Bertrandite images on Google</a></li></div></div><div class="mindatarow"><div class="mindatath">External Links:</div><div class="mindatam2"><li><a target="_blank" href="/web/20161210045251/http://www.mindat.org/click.php?enc=aHR0cDovL3d3dy53ZWJtaW5lcmFsLmNvbS9kYXRhL0JlcnRyYW5kaXRlLnNodG1s">Look for Bertrandite on Webmineral</a></li><li><a target="_blank" href="/web/20161210045251/http://www.mindat.org/click.php?enc=aHR0cDovL2VuLndpa2lwZWRpYS5vcmcvd2lraS9CZXJ0cmFuZGl0ZQ%3D%3D">Look for Bertrandite on Wikipedia</a></li><li><a target="_blank" href="/web/20161210045251/http://www.mindat.org/click.php?enc=aHR0cDovL3d3dy5taW5lcmFsaWVuYXRsYXMuZGUvbGV4aWtvbi9pbmRleC5waHAvQmVydHJhbmRpdGU%2FbGFuZz1lbg%3D%3D">Look for Bertrandite on Mineralien Atlas</a></li><li><a target="_blank" href="/web/20161210045251/http://www.mindat.org/click.php?enc=aHR0cDovL3JydWZmLmdlby5hcml6b25hLmVkdS9ycnVmZi9uZXdfcnJ1ZmYvY29uc3RydWN0b3IucGhwP3R4dF9taW5lcmFsPWJlcnRyYW5kaXRlJnNlbF9jaGVtaXN0cnlfaW5jbF9ib29sPWFuZCZ0eHRfY2hlbWlzdHJ5X2luY2w9JnNlbF9jaGVtaXN0cnlfZXhjbF9ib29sPWFuZCZ0eHRfY2hlbWlzdHJ5X2V4Y2w9JnNlbF9nZW5lcmFsX2Jvb2w9YW5kJnR4dF9nZW5lcmFsPSZzZWxfc29ydD1uYW1lcyZzZWxfc29ydF9kaXI9YXNjJmxpbWl0PTEwMDAwMCZvZmZzZXQ9MCZyPXNhbXBsZV9zZWFyY2gmbmV3X3NhbXBsZV9zZWFyY2g9MQ%3D%3D">Raman and XRD data at RRUFF project</a></li><li><a target="_blank" href="/web/20161210045251/http://www.mindat.org/click.php?enc=aHR0cDovL3JydWZmLmdlby5hcml6b25hLmVkdS9BTVMvcmVzdWx0LnBocD9taW5lcmFsPWJlcnRyYW5kaXRl">American Mineralogist Crystal Structure Database</a></li><li><a target="_blank" href="/web/20161210045251/http://www.mindat.org/click.php?enc=aHR0cDovL3d3dy5oYW5kYm9va29mbWluZXJhbG9neS5jb20vcGRmcy9iZXJ0cmFuZGl0ZS5wZGY%3D">Handbook of Mineralogy page PDF</a></li></div></div><div class="mindatarow"><div class="mindatath">Mineral Dealers:</div><div class="mindatam2"><li><a target="_blank" href="minclick.php?cid=616&m=Bertrandite"><b>Buy rare minerals from Excalibur Minerals</b></a><li><a target="_blank" href="minclick.php?cid=3247&m=Bertrandite"><b>Buy minerals from Anton Watzl minerals</b></a><li><a target="_blank" href="minclick.php?cid=467&m=Bertrandite"><b>Wilensky Fine Minerals</b></a><li><a target="_blank" href="minclick.php?cid=228&m=Bertrandite"><b>High-end worldwide specimens & outstanding customer service</b></a><li><a target="_blank" href="minclick.php?cid=302&m=Bertrandite"><b>Search for - Bertrandite - on e-Rocks Mineral Sales & Auctions</b></a><li><a target="_blank" href="minclick.php?cid=4674&m=Bertrandite"><b>Buy from McDougall Minerals</b></a><li><a target="_blank" href="minclick.php?cid=4637&m=Bertrandite"><b>Fine minerals from bisbeeborn.com</b></a><li><a target="_blank" href="minclick.php?cid=5079&m=Bertrandite"><b></b></a><li><a target="_blank" href="minclick.php?cid=173&m=Bertrandite"><b>The Arkenstone - Fine Minerals</b></a><li><a target="_blank" href="minclick.php?cid=4590&m=Bertrandite"><b>Quality Minerals at Fair Prices</b></a><li><a target="_blank" href="minclick.php?cid=179&m=Bertrandite"><b>Fine Minerals from Weinrich Minerals, Inc.</b></a><li><a target="_blank" href="minclick.php?cid=1402&m=Bertrandite"><b>Wendel Minerals - Auction & Shop</b></a></div></div><div class="mindatarow"><div class="mindatath">Specimens:</div><div class="mindatam2">The following <a href="https://web.archive.org/web/20161210045251/http://www.minfind.com/minsearch-642.html">Bertrandite specimens</a> are currently listed for sale on <a href="https://web.archive.org/web/20161210045251/http://www.minfind.com/">minfind.com</a>.</div></div><div class="mindatarow"><div class="minfindrow"><div id="minfindsales"><div class="minfindbox"><a title="Click for full details" target="_blank" href="https://web.archive.org/web/20161210045251/http://www.minfind.com/mineral-359461.html"><img src="https://web.archive.org/web/20161210045251im_/http://www.minfind.com/mfthumbs/90_90_000000_6510963554450e6f1a6b0.jpg"></a></div><div class="minfindbox"><a title="Click for full details" target="_blank" href="https://web.archive.org/web/20161210045251/http://www.minfind.com/mineral-358995.html"><img src="https://web.archive.org/web/20161210045251im_/http://www.minfind.com/mfthumbs/90_90_000000_20346270850f8d9aa608a0.jpg"></a></div><div class="minfindbox"><a title="Click for full details" target="_blank" href="https://web.archive.org/web/20161210045251/http://www.minfind.com/mineral-201123.html"><img src="https://web.archive.org/web/20161210045251im_/http://www.minfind.com/mfthumbs/90_90_000000_11225630175381d191f1457.jpg"></a></div><div class="minfindbox"><a title="Click for full details" target="_blank" href="https://web.archive.org/web/20161210045251/http://www.minfind.com/mineral-377720.html"><img src="https://web.archive.org/web/20161210045251im_/http://www.minfind.com/mfthumbs/90_90_000000_1168458890563dc00808d76.jpg"></a></div><div class="minfindbox"><a title="Click for full details" target="_blank" href="https://web.archive.org/web/20161210045251/http://www.minfind.com/mineral-461408.html"><img src="https://web.archive.org/web/20161210045251im_/http://www.minfind.com/mfthumbs/90_90_000000_176891409357d7dfcb75cfb.jpg"></a></div><div class="minfindbox"><a title="Click for full details" target="_blank" href="https://web.archive.org/web/20161210045251/http://www.minfind.com/mineral-377723.html"><img src="https://web.archive.org/web/20161210045251im_/http://www.minfind.com/mfthumbs/90_90_000000_259571395563dc013ad58b.jpg"></a></div><div class="minfindbox"><a title="Click for full details" target="_blank" href="https://web.archive.org/web/20161210045251/http://www.minfind.com/mineral-384561.html"><img src="https://web.archive.org/web/20161210045251im_/http://www.minfind.com/mfthumbs/90_90_000000_466921931565864f15c3e4.jpg"></a></div></div></div></div><h2 class="mindatadivh2">Localities for Bertrandite</h2><div><a name="themap"></a> <div id="map"></div> <div class="smalltxt"> map shows a selection of localities that have latitude and longitude coordinates recorded. 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