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You can search for an entry using this form:</p><div id="glossarysearch"> <script> gTabPos["glos"]=0; </script><script> function cfvalidate_glos() { var isval = 1; cfrichtextupdate_glos(); return true;} </script><form method="get" name="glos" action="/web/20161111193713/http://www.mindat.org/glossary.php" enctype="multipart/form-data" onsubmit="return(cfvalidate_glos());"><input type="hidden" name="frm_id" value="glos"><input type="hidden" name="cform_is_valid" value="1"><span>Search glossary for: </span><input type="text" id="s" name="s" value=""><input type="submit" value="Search Glossary" name="submit_glos"></form><script> function cfrichtextupdate_glos() { }</script></div><h2>Results</h2><ul id="glossary"><li><a href="/web/20161111193713/http://www.mindat.org/glossary/color_index">color index<div>In petrology, especially in the classification of igneous rocks, a number that represents the percent, by volume, of dark-colored ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/exotic_terrane">exotic terrane<div>These are juxtaposed, fault bounded microplates of differing geology and history formed by converging plate ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/letkya-dwin">letkya-dwin<div>A type of gem mining in Burma. Found in the karst topography of Mogok. It is a fracture-filled deposit, like a small narrow ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/cap_rock">cap rock<div>i. Barren vein matter, or a pinch in a vein, supposed to overlie ore. Synonym of: cap ii. A hard layer of rock, usually ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/granite">granite<div>i. A coarse grained, holocrystalline, felsic, acidic, plutonic rock in which quartz constitutes 10% to 50% of the felsic ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/acidic">acidic<div>1. Said of an igneous rock with a silica content above 63 weight-% (IUGS recommendation for the classification of igneous ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/quartz_monzonite">quartz monzonite<div>A medium- to coarse-grained, holocrystalline, acidic plutonic rock containing major plagioclase, orthoclase, and quartz, with ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/granodiorite">granodiorite<div>A group of coarse-grained plutonic rocks intermediate in composition between quartz diorite and quartz monzonite (U.S. usage), ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/granitic_rock">granitic rock<div>A term loosely applied to any light-colored, coarse-grained, felsic plutonic rock containing major quartz and feldspar with ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/monzonite">monzonite<div>A coarse grained plutonic rock containing approx. equal amounts of orthoclase and plagioclase, and thus intermediate between ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/granitoid">granitoid<div>A general grouping for coarse grained felsic rocks, synonymous with granitic rock, including granite, granodiorite, monzonite, ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/plutonic">plutonic<div>i. Pertaining to igneous rocks formed at great depths, generally coarse grained and holocrystalline. Compare with: ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/schiller">schiller<div>A variable optical phenomenon in gems or minerals, related to sheen; varies from a milky to an almost metallic shimmer to a vivid ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/peristerescence">peristerescence<div>A broad, diffuse white or bluish schiller or interference effect, seen in certain directions in some translucent sodic ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/schillerization">schillerization<div>An optical interference effect caused by diffused reflections and diffraction of light from microscopic sub-parallel intergrowths ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/adularescence">adularescence<div>A floating, billowy, white or bluish light, seen in certain directions as a cabachoned gemstone or mineral(usually adularia) is ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/labradorescence">labradorescence<div>A type of schiller, an iridescent optical interference of light caused by diffraction from microscopic sub-surface exsolution ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/chatoyancy">chatoyancy<div>An optical phenomenon, possessed by certain minerals in reflected light, in which a movable wavy or silky sheen is concentrated ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/asterism">asterism<div>i. Starlike rays of light observed in some minerals when viewed from certain directions, particularly if the mineral is cut en ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/aventurescence">aventurescence<div>A word used to describe the bright or strongly colored, usually metallic spangled reflection effect seen, in hand specimens, in ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/sheen">sheen<div>i. A subdued and commonly iridescent or metallic glitter that approaches but is just short of optical reflection and that ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/metacarbonate_slag">metacarbonate slag<div>Metacarbonate slag, also called slag, is a type of pyrometamorphic rock associated with natural coal-fires, e.g., in burning coal ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/buchite">buchite<div>An uncommon metamorphic rock type composed mostly of glass, formed by the melting of a sedimentary rock or soil by heat from an ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/clinker">clinker<div>i. Fused or partly fused coal ash, a byproduct of combustion. According to Grapes (2006) it is now concerning fused and/or ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/paralava">paralava<div>Paralava, or parabasalt, is a pyrometamorphic rock that is vesicular, aphanitic, often ropy and with clear flow structures, ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/porcellanite">porcellanite<div>A dense siliceous rock having the texture, dull luster, hardness, conchoidal fracture, and general appearance of unglazed ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/black_block">black block<div>Black block is a term used for black, soot-rich parts of burning coal-mining dumps, that underwent thermal transformations by low ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/sulphate_crust">sulphate crust<div>Sulphate crust is a geological formation occurring in burning coal-mining dumps. It is an accumulation of mostly anhydrous (core) ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/sanidinite">sanidinite<div>A high temperature, contact metamorphic rock composed principally of sanidine, usually fine grained.</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/interference_colours">interference colours<div>These "rainbows" are all thin film interference colours. In many cases, oil on water, etc., there is a thin film. However in the ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/betafite">betafite<div>An isometric mineral, (Ca,Na,U)2 (Ti,Nb,Ta)2 O6 (OH); pyrochlore group; forms a series with pyrochlore; nowadays obsolete name ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/graphic">graphic<div>i. Said of the texture of an igneous rock that results from the regular intergrowth of quartz and feldspar crystals. The quartz ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/rain_fall_agate">rain fall agate<div>See Yuhua Stone</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/yuhua_stone">yuhua stone<div>Any pretty pebble from http://www.mindat.org/loc-270534.html is a Yuhua Stone. For 1500 hundred years these have been treasured ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/anthodites">anthodites<div>(Greek ἄνθος ánthos, “flower”, -ode, adjectival combining form, -ite adjectival suffix) are speleothems (cave ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/ptygmatic_folding">ptygmatic folding<div>Primary folding in migmatites (injection gneisses, etc.), caused by the high-temperature and high-pressure processes to which the ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/orbicular_structure">orbicular structure<div>A structure developed in certain phanerocrystalline rocks (e.g., granite and diorite) due to the occurrence of numerous ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/tufa">tufa<div>A chemical sedimentary rock composed of calcium carbonate, formed by evaporation as a surficial, spongy, porous, semifriable ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/hoist">hoist<div>i. The windlass mechanism incorporated as an integral part of a power-driven drilling machine used to handle, hoist, and lower ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/mineral_parting">mineral parting<div>Mineral breakage along specific crystallographic planes in some specimens due to twinning, exsolution lamellae, or chemical ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/exsolution_texture">exsolution texture<div>A general term for the texture of any mineral aggregate or intergrowth formed by exsolution. It is generally fairly homogeneous, ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/wehrlite_(rock)">wehrlite (rock)<div>A peridotite composed chiefly of olivine and clinopyroxene with accessory opaque oxides common.</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/liparite">liparite<div>A syn. of rhyolite used by German and Soviet authors. Its name, given by Roth in 1861, is derived from the Lipari Islands, in the ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/columnar_jointing">columnar jointing<div>Parallel, prismatic columns, polygonal in cross section, in basaltic flows and sometimes in other extrusive and intrusive rocks. ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/warrenite">warrenite<div>i. A general term for gaseous and liquid bitumens consisting mainly of a mixture of paraffins and isoparaffins: a variety of ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/breccia">breccia<div>A coarse-grained clastic rock, composed of angular broken rock fragments held together by a mineral cement or in a fine-grained ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/framboidal_texture">framboidal texture<div>A texture in which pellets form spheroidal aggregates resembling a raspberry. PyritePyrite</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/skarn">skarn<div>An old Swedish mining term for silicate gangue (amphibole, pyroxene, garnet, etc.) of certain iron ore and sulfide deposits of ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/triboluminescence">triboluminescence<div>i. The property of some specimens of zinc sulfide of emitting sparks when scratched. Ref: Fay ii. Luminescence in which ...</div></a></li><li><a href="/web/20161111193713/http://www.mindat.org/glossary/indicator_mineral">indicator mineral<div>An indicator mineral occurs with an ore mineral and indicates it presence. A hand sample of the ore mineral may be devoid of the ...</div></a></li></ul></div><div id="backdropad" class="hidetablet hidephone"></div> <div id="backdroptext" class="hidetablet hidephone"></div> <div id="backdropadt" class="hidephone hidepc"></div> <div id="backdroptextt" class="hidephone hidepc"></div> <div id="backdropadm" class="hidetablet hidepc"></div> <div id="backdroptextm" class="hidetablet hidepc"></div> <video id="backdropvid"></video> <div id="backdropfade"></div> </div><div id="bformblock"> <form class="flatform" method="get" action="/web/20161111193713/http://www.mindat.org/nsearch.php"> Mineral <input name="name" style="width: 137px;"/> and/or Locality <input name="loc" style="width: 137px;"> <input type="submit" value="Search"/> </form> </div> <div id="footertext"> Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.<br>Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2016, except where stated. 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