Editing Pyrite (section)

==Occurrence==
Pyrite is the most common of sulfide minerals and is widespread in igneous, metamorphic, and sedimentary rocks. It is a common accessory mineral in igneous rocks, where it also occasionally occurs as larger masses arising from an [[Miscibility|immiscible]] sulfide phase in the original magma. It is found in metamorphic rocks as a product of [[contact metamorphism]]. It also forms as a high-temperature [[hydrothermal mineralization|hydrothermal mineral]], though it occasionally forms at lower temperatures.<ref name="Hurlbut"/>
 
Pyrite occurs both as a primary mineral, present in the original sediments, and as a secondary mineral, deposited during [[diagenesis]].<ref name="Hurlbut"/> Pyrite and [[marcasite]] commonly occur as replacement [[pseudomorph]]s after [[fossils]] in [[black shale]] and other [[sedimentary rocks]] formed under [[Redox|reducing]] environmental conditions.<ref>{{Cite journal|last1=Briggs|first1=D. E. G.|last2=Raiswell|first2=R.|last3=Bottrell|first3=S. H.|last4=Hatfield|first4=D.|last5=Bartels|first5=C.|date=1996-06-01|title=Controls on the pyritization of exceptionally preserved fossils; an analysis of the Lower Devonian Hunsrueck Slate of Germany|journal=American Journal of Science|language=en|volume=296|issue=6|pages=633–663|doi=10.2475/ajs.296.6.633|issn=0002-9599|bibcode=1996AmJS..296..633B}}</ref> Pyrite is common as an accessory mineral in shale, where it is formed by precipitation from anoxic seawater, and coal beds often contain significant pyrite.<ref>{{cite book |last1=Nesse |first1=William D. |title=Introduction to mineralogy |date=2000 |publisher=Oxford University Press |location=New York |isbn=9780195106916 |page=390}}</ref>

Notable deposits are found as lenticular masses in Virginia, U.S., and in smaller quantities in many other locations. Large deposits are mined at Rio Tinto in Spain and elsewhere in the Iberian Peninsula.<ref>{{Cite journal |last=J.M. Leistel, E. Marcoux, D. Thiéblemont, C. Quesada, A. Sánchez, G.R. Almodóvar, E. Pascualand R. Sáez |title=The volcanic-hosted massive sulphide deposits of the Iberian Pyrite Belt |journal=Mineralium Deposita |date=1997 |volume=33 |issue=1–2 |pages=2–30|doi=10.1007/s001260050130 |bibcode=1997MinDe..33....2L }}</ref>