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<front>
<journal-meta>
<journal-id journal-id-type="archive">gsminmag</journal-id>
<journal-title>Mineralogical Magazine</journal-title>
<abbrev-journal-title abbrev-type="full">Mineralogical Magazine</abbrev-journal-title>
<issn pub-type="ppub">0026-461X</issn>
<publisher>
<publisher-name>Mineralogical Society</publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="doi">10.1180/minmag.1997.061.408.01</article-id>
<title-group>
<article-title>An EXAFS Study of the Local Structural Environments of Fe, Co, Zn and Mg in Natural and Synthetic Staurolites</article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname>Henderson</surname>
<given-names>C. M. B.</given-names>
</name></contrib>
<contrib contrib-type="author">
<name>
<surname>Charnock</surname>
<given-names>J. M.</given-names>
</name></contrib>
<aff>Department of Earth Sciences, University of Manchester, Manchester M13 9PL and Daresbury Laboratory, CLRC, Warrington WA4 4AD, UK</aff></contrib-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname>Cressey</surname>
<given-names>G.</given-names>
</name>
<aff>Department of Mineralogy, Natural History Museum, London SW7 5BD, UK</aff></contrib>
<contrib contrib-type="author">
<name>
<surname>Griffen</surname>
<given-names>D. T.</given-names>
</name>
<aff>Department of Geology, Brigham Young University, Provo, Utah 84602, USA</aff></contrib></contrib-group>
<pub-date pub-type="ppub">
<month>10</month>
<year>1997</year>
</pub-date>
<volume>61</volume>
<issue>408</issue>
<fpage>613</fpage>
<lpage>625</lpage>
<history>
<date date-type="received">
<day>4</day>
<month>11</month>
<year>1996</year>
</date>
<date date-type="rev-recd">
<day>6</day>
<month>1</month>
<year>1997</year>
</date></history>
<copyright-statement>Copyright &#x00A9; 1997, The Mineralogical Society</copyright-statement>
<copyright-year>1997</copyright-year>
<abstract>
<title>Abstract</title>
<p>X-ray absorption spectroscopy (XAS) has been used to study the local structures of Fe, Co, Zn, and Mg in synthetic and natural staurolites. Results for the near-edge features (XANES) and refined EXAFS were used to deduce the crystallographic site(s) occupied for each element. The least squares refined, mean first shell metal-O bond lengths, coordination numbers, and Debye-Waller factors are in the ranges: Fe 1.97&#x2013;1.99 &#x00C5;, 3.5&#x2013;4.1, 0.013&#x2013;0.023 &#x00C5;<sup>2</sup>; Co 1.97&#x2013;1.98 &#x00C5;, 3.5&#x2013;3.9, 0.009&#x2013;0.014 &#x00C5;<sup>2</sup>; Zn 1.95&#x2013;1.96 &#x00C5;, 3.7&#x2013;3.8, 0.008&#x2013;0.009 &#x00C5;<sup>2</sup>; and Mn 1.99 &#x00C5;, 3.8, 0.012 &#x00C5;<sup>2</sup>. No significant differences were found which depended on element concentration or whether the sampes are synthetic or natural. The refined bond length for Mg in end-member Mg-staurolite is 2.00 &#x00C5; but EXAFS data did not allow refinement to give reliable coordination number and Debye-Waller factor estimates. The EXAFS data, together with staurolite and model compound XANES features, suggest that &#x003E; about 90% of Fe, Co, Zn and Mn are concentrated in the tetrahedral T2 site, while in Mg-staurolite &#x003E; about 75% of the total Mg is in T2 with the remainder in octahedral sites. In natural staurolite from Pizzo Forno (PF2), a greater proportion of Mg appears to be in octahedral coordination.</p></abstract>
<kwd-group>
<title>Keywords</title>
<kwd>EXAFS</kwd>
<kwd>staurolite</kwd>
<kwd>XANES</kwd>
<kwd>local structural environment</kwd>
</kwd-group>
</article-meta>
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</article>
