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Arsenopyrite
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<h2 id="crystallography">Crystallography</h2> <p>Arsenopyrite crystallizes in the <a href="/facts/Monoclinic/5PCwXvzX">monoclinic</a> <a href="/facts/Crystal_system/dMQLk1q4">crystal system</a> and often shows prismatic crystal or columnar forms with <a href="/facts/Striation_(geology)/PRXvx9We">striations</a> and <a href="/facts/Crystal_twinning/7xU6CKfR">twinning</a> common. Arsenopyrite may be referred to in older references as <a href="/facts/Orthorhombic/3zo4F8P0">orthorhombic</a>, but it has been shown to be monoclinic. In terms of its atomic structure, each Fe center is linked to three As atoms and three S atoms. The material can be described as Fe3+ with the diatomic trianion AsS3−. The connectivity of the atoms is more similar to that in <a href="/facts/Marcasite/vP4CW3QC">marcasite</a> than <a href="/facts/Pyrite/41CYREyr">pyrite</a>. The ion description is imperfect because the material is semiconducting and the Fe-As and Fe-S bonds are highly <a href="/facts/Covalent/EzMLf3Pz">covalent</a>.<a class="footnote-ref" id="fnref:5" href="#fn:5"><sup>5</sup></a> </p> <h2 id="related-minerals">Related minerals</h2> <p>Various <a href="/facts/Transition_metal/0slGWoLQ">transition</a> group metals can substitute for iron in arsenopyrite. The arsenopyrite group includes the following rare minerals: </p> <ul><li>Clinosafflorite: (Co,Fe,Ni)AsS</li> <li>Gudmundite: FeSbS</li> <li><a href="/facts/Glaucodot/lgPV9nB2">Glaucodot</a> or <a href="/facts/Alloclasite/qDQLaWRE">alloclasite</a>: (Fe,Co)AsS or (Co,Fe)AsS</li> <li>Iridarsenite: (Ir,Ru)AsS</li> <li>Osarsite or ruarsite: (Os,Ru)AsS or (Ru,Os)AsS</li></ul> <h2 id="see-also">See also</h2> <ul><li> Earth sciences portal</li> <li><a href="/facts/Classification_of_minerals_(disambiguation)/AeFz2WWJ">Classification of minerals</a></li> <li><a href="/facts/List_of_minerals/4rMMcv2D">List of minerals</a></li></ul> <h2 id="external-links">External links</h2> <ul><li> Media related to Arsenopyrite at Wikimedia Commons</li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Warr, L.N. (2021). "IMA-CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616. <a href="https://doi.org/10.1180%2Fmgm.2021.43" target="_blank">https://doi.org/10.1180%2Fmgm.2021.43</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>"Mohs Hardness Scale: Testing the Resistance to Being Scratched". geology.com. Retrieved 2024-04-10. <a href="https://geology.com/minerals/mohs-hardness-scale.shtml" target="_blank">https://geology.com/minerals/mohs-hardness-scale.shtml</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Hurlbut, C. S.; Klein, C., 1985, Manual of Mineralogy, 20th ed., ISBN 0-471-80580-7 <a href="/wiki/ISBN_(identifier)" target="_blank">/wiki/ISBN_(identifier)</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>Mindat Mispickel <a href="http://www.mindat.org/min-4652.html" target="_blank">http://www.mindat.org/min-4652.html</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>Vaugn, D. J.; Craig, J. R. Mineral Chemistry of Metal Sulfides" Cambridge University Press, Cambridge: 1978. ISBN 0-521-21489-0. <a href="/wiki/ISBN_(identifier)" target="_blank">/wiki/ISBN_(identifier)</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> </ol>