Characterization of a high-pressure phase of silica from the Martian meteorite Shergotty

<!DOCTYPE html> <html lang="en" xmlns:mml="http://www.w3.org/1998/Math/MathML"> <head> <meta charset="utf-8"> <meta http-equiv="x-ua-compatible" content="ie=edge"> <title>Characterization of a high-pressure phase of silica from the Martian meteorite Shergotty</title>  <link rel="preload" href="/assets/fonts/montserrat-v15-latin-ext_cyrillic-ext-regular.woff2" as="font" type="font/woff2" crossorigin="anonymous"> <link rel="preload" href="/assets/fonts/montserrat-v25-latin-ext_cyrillic-ext-500.woff2" as="font" type="font/woff2" crossorigin="anonymous"> <link rel="preload" href="/assets/fonts/montserrat-v15-latin-ext_cyrillic-ext-700.woff2" as="font" type="font/woff2" crossorigin="anonymous">  <link rel="preload" href="/assets/fonts/merriweather-v30-latin-ext_cyrillic-ext-300.woff2" as="font" type="font/woff2" crossorigin="anonymous"> <link rel="preload" href="/assets/fonts/merriweather-v22-latin-ext_cyrillic-ext-regular.woff2" as="font" type="font/woff2" crossorigin="anonymous"> <link rel="preload" href="/assets/fonts/merriweather-v22-latin-ext_cyrillic-ext-700.woff2" as="font" type="font/woff2" crossorigin="anonymous">  <link rel="preload" href="/assets/stylesheets/fontawesome.woff2" as="font" type="font/woff2" crossorigin="anonymous"> <link rel="stylesheet" media="all" href='/assets/stylesheets/02f295d1f6a8e9c282e7831cd493e8ff-bootstrap.purged.min.css' /> <link rel="stylesheet" media="all" href='/assets/stylesheets/5337b0511e7530e28f005276f70cde44-main.min.css' /> <link rel="stylesheet" media="all" href='/assets/stylesheets/13761c60ba5201f465803f3005ccd7ef-fontawesome-codes.css' /> <link rel="shortcut icon" type="image/x-icon" href='/assets/images/ec7d7606b4e2f3f921b5e1700948efb6-favicon.ico' /> <link rel="alternate" hreflang="en" href="https://www.degruyter.com/document/doi/10.2138/am-2002-0728/html?lang=en" /> <link rel="alternate" hreflang="de" href="https://www.degruyter.com/document/doi/10.2138/am-2002-0728/html?lang=de" /> <link rel="alternate" hreflang="x-default" href="https://www.degruyter.com/document/doi/10.2138/am-2002-0728/html" />  <link rel="schema.dcterms" href="http://purl.org/dc/terms/"> <meta name="dcterms.rightsHolder" content="Walter de Gruyter GmbH"> <meta name="dcterms.rights" content="De Gruyter expressly reserves the right to use all content for commercial text and data mining within the meaning of Section 44b of the German Copyright Act."> <link rel="dns-prefetch" href="https://www.google-analytics.com" /> <meta name="google" content="notranslate" /> <meta name="viewport" content="width=device-width, initial-scale=1" /> <meta name="description" content="Recently, there has been substantial interest in post-stishovite high-pressure polymorphs of SiO 2 , discovered as extraterrestrial minerals, or synthesized in the laboratory. Previous investigators reported the presence of “α-PbO 2 -like” and “baddeleyite-like” SiO 2 in the Martian meteorite Shergotty, and also the synthesis of an a-PbO 2 -like phase at pressures of 60-80 GPa in a laser-heated diamond anvil cell. To provide definitive information about the nature of the natural “a-PbO 2 phase,” we recovered a small sample from the Shergotty meteorite, obtained powder X-ray diffraction patterns, and performed a Rietveld refinement of the structure. The resulting cell parameters and space group are a = 4.097(1) Å, b = 5.0462(9) Å, c = 4.4946(8) Å, and Pbcn. The structure refinement confirms that this sample does have the α-PbO 2 structure"/> <meta property="og:url" content="https://www.degruyter.com/document/doi/10.2138/am-2002-0728/html"/><meta property="og:site_name" content="De Gruyter"/><meta property="og:title" content="Characterization of a high-pressure phase of silica from the Martian meteorite Shergotty"/><meta property="og:type" content="article"/><meta property="og:locale" content="en"/><meta property="og:image" content="https://www.degruyter.com/document/cover/journal_key/AMMIN/product"/><meta property="og:image:type" content="image/jpeg"/><meta property="og:description" content="Recently, there has been substantial interest in post-stishovite high-pressure polymorphs of SiO 2 , discovered as extraterrestrial minerals, or synthesized in the laboratory. Previous investigators reported the presence of “α-PbO 2 -like” and “baddeleyite-like” SiO 2 in the Martian meteorite Shergotty, and also the synthesis of an a-PbO 2 -like phase at pressures of 60-80 GPa in a laser-heated diamond anvil cell. To provide definitive information about the nature of the natural “a-PbO 2 phase,” we recovered a small sample from the Shergotty meteorite, obtained powder X-ray diffraction patterns, and performed a Rietveld refinement of the structure. The resulting cell parameters and space group are a = 4.097(1) Å, b = 5.0462(9) Å, c = 4.4946(8) Å, and Pbcn. The structure refinement confirms that this sample does have the α-PbO 2 structure"/><meta property="og:locale:alternate" content="de"/><meta property="article:author" content="Przemyslaw Dera"/><meta property="article:author" content="Charles T. Prewitt"/><meta property="article:author" content="Nabil Z. Boctor"/><meta property="article:author" content="Russell J. Hemley"/><meta property="article:published_time" content="2002-07-01"/><meta property="article:section" content="American Mineralogist"/> <meta name="citation_firstpage" content="1018" /> <meta name="citation_lastpage" content="1023" /> <meta name="citation_issue" content="7" /> <meta name="citation_issn" content="1945-3027" /> <meta name="citation_language" content='en' /> <meta name="citation_volume" content="87" /> <meta name="citation_publisher" content='De Gruyter' /> <meta name="citation_author" content="Przemyslaw Dera" /> <meta name="citation_author" content="Charles T. Prewitt" /> <meta name="citation_author" content="Nabil Z. Boctor" /> <meta name="citation_author" content="Russell J. Hemley" /> <meta name="citation_title" content='Characterization of a high-pressure phase of silica from the Martian meteorite Shergotty' /> <meta name="citation_xml_url" content="https://www.degruyter.com/document/doi/10.2138/am-2002-0728/xml" /> <meta name="citation_journal_title" content="American Mineralogist" /> <meta name="citation_publication_date" content='2002/07/01' /> <meta name="citation_doi" content="10.2138/am-2002-0728" /> <script type="application/ld+json">{"author":[{"@type":"Person","name":"Przemyslaw Dera"},{"@type":"Person","name":"Charles T. Prewitt"},{"@type":"Person","name":"Nabil Z. Boctor"},{"@type":"Person","name":"Russell J. 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Your documents are now available to view.</p> <div id="orderCompleteItemList"> </div> </div> </div> </div> </div> <main id="main" class='language_en min-vh-100 '> <div class="row no-theme-gutter-x g-0 " id="docContent"> <div class='offset-lg-1 col-lg-8 pb-2'> <div class='row g-0 '> <div class="col p-3 pt-5"> <div class="d-flex flex-wrap flex-column flex-md-row justify-content-between"> <div> <div class="mb-2"> <span class="d-none itemAuthorized"> <span class="fa fas fa-icon-authorized"></span> <span class="accessAccessible me-2">Licensed</span> </span> <span class="d-none itemNotAuthorized"> <span class="fa fas fa-icon-not-authorized"></span> <span class="d-none notAuthUserLoggedIn accessRequireAuth me-2">Unlicensed</span> <span class="d-none notAuthUserLoggedOut accessRequireAuth me-2">Requires Authentication</span> </span> <span class="publisherAndPublicationDate metadataInfoMainContent"> <span class="publisher"> Published by <a class="ga_published_by ga_published_by_header" href='/search?query=*&publisherFacet=De+Gruyter'>De Gruyter</a> </span> <span class="publicationDate">March 28, 2015</span> </span> </div> <div id="mobilePurchaseDiv" class="d-none"> <a class="mobilePurchaseButton" href="#"> Purchase article <svg width="17" height="16" viewBox="0 0 17 16" fill="none" xmlns="http://www.w3.org/2000/svg"> <path fill-rule="evenodd" clip-rule="evenodd" d="M12.75 10.3238L11.4513 9L9.5 11.1469L9.5 1L7.5 1L7.5 11.1473L5.54829 9L4.24962 10.3238L8.49981 15L12.75 10.3238Z" fill="#007596"/> </svg> </a> </div> <h1>Characterization of a high-pressure phase of silica from the Martian meteorite Shergotty</h1> <ul class="contributors list-unstyled mb-2"> <li class="contributors-AUTHOR mb-2"> <span class="metadataAndContributorsFont"><span class="contributor"> <span class="displayName linkAnimation">Przemyslaw Dera</span> <contributor-popdown name="Przemyslaw Dera" position="1" email="pdera@gl.ciw.edu" affiliations="Geophysical Laboratory and Center for High Pressure Research, Carnegie Institution of Washington, 5251 Broad Branch Road, N.W., Washington, D.C. 20015, U.S.A." > </contributor-popdown> <a href="mailto:pdera@gl.ciw.edu"> <img alt="EMAIL logo" src='/assets/images/db2546a9d03b905bae083962a41791e1-mail.svg' width="16" height="12" /> </a> </span><span class="comma">, </span><span class="contributor"> <span class="displayName linkAnimation">Charles T. Prewitt</span> <contributor-popdown name="Charles T. Prewitt" position="2" email="" affiliations="Geophysical Laboratory and Center for High Pressure Research, Carnegie Institution of Washington, 5251 Broad Branch Road, N.W., Washington, D.C. 20015, U.S.A." > </contributor-popdown> </span><span class="comma">, </span><span class="contributor"> <span class="displayName linkAnimation">Nabil Z. Boctor</span> <contributor-popdown name="Nabil Z. Boctor" position="3" email="" affiliations="Geophysical Laboratory and Center for High Pressure Research, Carnegie Institution of Washington, 5251 Broad Branch Road, N.W., Washington, D.C. 20015, U.S.A." > </contributor-popdown> </span> and <span class="contributor"> <span class="displayName linkAnimation">Russell J. Hemley</span> <contributor-popdown name="Russell J. Hemley" position="4" email="" affiliations="Geophysical Laboratory and Center for High Pressure Research, Carnegie Institution of Washington, 5251 Broad Branch Road, N.W., Washington, D.C. 20015, U.S.A." > </contributor-popdown> </span></span> </li> </ul> <div class="subTitleInfoProductPage">From the journal <a class="ga_parent ga_parent_journal" href="/journal/key/ammin/html">American Mineralogist</a></div> <div class="doi"><a href="https://doi.org/10.2138/am-2002-0728" class="linkWithoutStyle subTitleInfoProductPage ga_doi" target="_blank">https://doi.org/10.2138/am-2002-0728</a></div> </div> </div> </div> <div class="d-flex align-items-center flex-wrap px-4 px-lg-2 "> <button id='citationsModalButton' type="button" class="btn btn-main-content ga_cite_this me-2" href='#citationsModal' data-bs-toggle="modal" data-bs-target="#citationsModal" data-doi="10.2138/am-2002-0728" aria-controls='citationsModal'> Cite this </button> <button id="socialModalButton" type="button" class="btn btn-main-content ga_share_this me-2" href="#socialModal" data-bs-toggle="modal" data-bs-target="#socialModal" aria-controls="socialModal"> Share this </button> <div class="dimensions __dimensions_badge_embed__ ga_dimensions_citation me-2" data-doi="10.2138/am-2002-0728" data-hide-zero-citations="true" data-legend="never" data-style="large_rectangle"></div> </div> <div id="div-document-progress-bar" class="sticky-top d-none"> <div class="row"> <div class="col-12"> <div class="progress progress-bar-toolbar"> <div id="document-progress-bar" class="progress-bar bg-primary" role="progressbar" aria-label="Document progress bar" aria-valuenow="0" aria-valuemin="0" aria-valuemax="100"></div> </div> </div> </div> </div> <div id="document-main-content" class='row'> <div class="container-fluid px-3 px-lg-0 py-2"> <div class="col"> <div class="d-none analyticsHolder" data-subjects='GS|GS-05|MS|MS-01' data-publisherCode='DEGINC' data-license='restricted' data-publisher='De Gruyter' data-contentName='Characterization of a high-pressure phase of silica from the Martian meteorite Shergotty' data-doi='10.2138/am-2002-0728' data-parentIdentifier='AMMIN' data-parentName='American Mineralogist' data-languages='en' ></div> <div id="documentContent" class="content py-2" data-doi='10.2138/am-2002-0728' data-accessrestricted="true" data-countertype="document"> <div class="px-2"> <div class="alert alert-info-box" role="alert"> <div id="noAccessReasonSpinner"> <div class="spinner-border text-primary" role="status"></div> </div> <div id="noAccessReasonContent"> <small class="fa fas fa-block"></small> <small id="noAccessReason"></small> <div class="previewAlertContainer"> <small class="previewAlert">Showing a limited preview of this publication:</small> </div> </div> </div> <div id="text-container"> <div xmlns:dgdoi="http://degruyter.com/resources/doi-from-crossref" xmlns:dgpm="http://degruyter.com/resources/fetched-pubmed-id" class="contentWrapper"><div class="article" lang="en"><div class="abstract"><h2 class="subheading">Abstract</h2><p> Recently, there has been substantial interest in post-stishovite high-pressure polymorphs of SiO<sub>2</sub>, discovered as extraterrestrial minerals, or synthesized in the laboratory. Previous investigators reported the presence of “α-PbO<sub>2</sub>-like” and “baddeleyite-like” SiO<sub>2</sub> in the Martian meteorite Shergotty, and also the synthesis of an a-PbO<sub>2</sub>-like phase at pressures of 60-80 GPa in a laser-heated diamond anvil cell. To provide definitive information about the nature of the natural “a-PbO<sub>2</sub> phase,” we recovered a small sample from the Shergotty meteorite, obtained powder X-ray diffraction patterns, and performed a Rietveld refinement of the structure. The resulting cell parameters and space group are a = 4.097(1) Å, b = 5.0462(9) Å, c = 4.4946(8) Å, and Pbcn. The structure refinement confirms that this sample does have the α-PbO<sub>2</sub> structure</p></div><div class="contrib-group"></div><div class="publicationDates mb-3"><div class="receivedDate"><span class="label-received"><span><strong>Received: </strong></span></span>2002-1-15</div><div class="acceptedDate"><span class="label-accepted"><span><strong>Accepted: </strong></span></span>2002-4-19</div><div class="publishedOnlineDate"><span class="label-publishedOnline"><span><strong>Published Online: </strong></span></span>2015-3-28</div><div class="publishedInPrintDate"><span class="label-publishedInPrint"><span><strong>Published in Print: </strong></span></span>2002-7-1</div></div><div class="copyrightStatement"><p>© 2015 by Walter de Gruyter Berlin/Boston</p></div></div></div> </div> </div> </div> <div class="modal" id="citationsModal" tabindex="-1" role="dialog" aria-label='Cite this' aria-hidden="true"> <div class="modal-dialog modal-dialog-centered modal-lg" role="document"> <div class="modal-content bg-white"> <div class="modal-body"> <button type="button" class="btn-close float-end btn-modal-close" data-bs-dismiss="modal" aria-label='Close'></button> <div id="citations"> <div class="row pb-2"> <div class="col"> <div class="text-dark fw-bold">Cite this article</div> </div> </div> <div class="row p-2"> <div class="col-lg-auto ps-4 mb-3 mb-lg-0"> <ul class="nav d-flex flex-lg-column" id="citationSelector" role="tablist"> <li class="nav-item py-1" role="presentation"> <a class="nav-link citations py-0 font-size-14 active" id="MLA-tab" data-bs-toggle="tab" href="#MLA" role="tab" aria-controls="MLA" aria-selected="true"> <span class="text-primary fa fas fa-ok me-2"></span> <span class="font-family-standard text-dark">MLA</span> </a> </li> <li class="nav-item py-1" role="presentation"> <a class="nav-link citations py-0 font-size-14 " id="APA-tab" data-bs-toggle="tab" href="#APA" role="tab" aria-controls="APA" aria-selected="true"> <span class="text-primary fa fas fa-ok me-2"></span> <span class="font-family-standard text-dark">APA</span> </a> </li> <li class="nav-item py-1" role="presentation"> <a class="nav-link citations py-0 font-size-14 " id="Harvard-tab" data-bs-toggle="tab" href="#Harvard" role="tab" aria-controls="Harvard" aria-selected="true"> <span class="text-primary fa fas fa-ok me-2"></span> <span class="font-family-standard text-dark">Harvard</span> </a> </li> <li class="nav-item py-1" role="presentation"> <a class="nav-link citations py-0 font-size-14 " id="Chicago-tab" data-bs-toggle="tab" href="#Chicago" role="tab" aria-controls="Chicago" aria-selected="true"> <span class="text-primary fa fas fa-ok me-2"></span> <span class="font-family-standard text-dark">Chicago</span> </a> </li> <li class="nav-item py-1" role="presentation"> <a class="nav-link citations py-0 font-size-14 " id="Vancouver-tab" data-bs-toggle="tab" href="#Vancouver" role="tab" aria-controls="Vancouver" aria-selected="true"> <span class="text-primary fa fas fa-ok me-2"></span> <span class="font-family-standard text-dark">Vancouver</span> </a> </li> </ul> </div> <div class="col"> <div class="tab-content border pt-4 px-4" id="citationContent"> <div class="tab-pane fade show active" id="MLA" role="tabpanel" aria-labelledby="MLA-tab">Dera, Przemyslaw, Prewitt, Charles T., Boctor, Nabil Z. and Hemley, Russell J.. "Characterization of a high-pressure phase of silica from the Martian meteorite Shergotty" <i>American Mineralogist</i>, vol. 87, no. 7, 2002, pp. 1018-1023. <a href='https://doi.org/10.2138/am-2002-0728'>https://doi.org/10.2138/am-2002-0728</a></div> <div class="tab-pane fade " id="APA" role="tabpanel" aria-labelledby="APA-tab">Dera, P., Prewitt, C., Boctor, N. & Hemley, R. (2002). Characterization of a high-pressure phase of silica from the Martian meteorite Shergotty. <i>American Mineralogist</i>, <i>87</i>(7), 1018-1023. <a href='https://doi.org/10.2138/am-2002-0728'>https://doi.org/10.2138/am-2002-0728</a></div> <div class="tab-pane fade " id="Harvard" role="tabpanel" aria-labelledby="Harvard-tab">Dera, P., Prewitt, C., Boctor, N. and Hemley, R. (2002) Characterization of a high-pressure phase of silica from the Martian meteorite Shergotty. American Mineralogist, Vol. 87 (Issue 7), pp. 1018-1023. <a href='https://doi.org/10.2138/am-2002-0728'>https://doi.org/10.2138/am-2002-0728</a></div> <div class="tab-pane fade " id="Chicago" role="tabpanel" aria-labelledby="Chicago-tab">Dera, Przemyslaw, Prewitt, Charles T., Boctor, Nabil Z. and Hemley, Russell J.. "Characterization of a high-pressure phase of silica from the Martian meteorite Shergotty" <i>American Mineralogist</i> 87, no. 7 (2002): 1018-1023. <a href='https://doi.org/10.2138/am-2002-0728'>https://doi.org/10.2138/am-2002-0728</a></div> <div class="tab-pane fade " id="Vancouver" role="tabpanel" aria-labelledby="Vancouver-tab">Dera P, Prewitt C, Boctor N, Hemley R. 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Characterization of a high-pressure phase of silica from the Martian meteorite Shergotty