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Coesite: SiO2
Comments: Coesite inclusion in garnet of eclogite sample (Eur. J. Mineral, 13:567). Location: Ultra high-pressure metamorphic area of the Saidenbach reservoir, Erzgebirge, Germany, where micro-diamond-bearing gneiss occurs. Scale: Scale Bar 50 µm. © Eur. J. Mineral
Comments: Fine-grained, massive coesite. Location: Meteor Crater, Canyon Diablo, Coconino County, Arizona, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species