Image: Cristobalite-Fayalite-40048
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Description: Cristobalite, Fayalite Locality: Canyon Butte occurrence (Couger Butte), Canyon Butte, Siskiyou County, California, USA (Locality at mindat.org) Obsidian (volcanic glass) cools too quickly to crystallize. Thus, it is unusual to see minerals attached. The spheres of high temperature cristobalite (SiO2) are actually the result of devitrification, or loss of silica from the obsidian. Most unusual. 5.9 x 3.8 x 3.8 cm
Title: Cristobalite-Fayalite-40048
Credit: http://www.mindat.org/photo-40048.html
Author: Robert M. Lavinsky
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC BY-SA 3.0
License Link: https://creativecommons.org/licenses/by-sa/3.0
Attribution Required?: Yes
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