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Anhydrite
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===Igneous rocks=== Anhydrite has been found in some [[igneous rock]]s, for example in the [[Intrusive rock|intrusive]] [[Diorite|dioritic]] [[pluton]] of El Teniente, Chile and in [[trachyandesite]] [[pumice]] erupted by [[El Chichón]] volcano, Mexico.<ref>{{cite journal|title=Primary igneous anhydrite: Progress since its recognition in the 1982 El Chichón trachyandesite|last=Luhr|first=James F.|journal=Journal of Volcanology and Geothermal Research|year=2008|volume=175|issue=4|pages=394–407|doi=10.1016/j.jvolgeores.2008.02.016|bibcode=2008JVGR..175..394L}}</ref>
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