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Mineral specimen # :BALD0503
Cristobalite and Fayalite in Obsidian - Cougar Butte occurrence (Canyon Butte; Couger Butte), Cougar Butte, Cascade Range, Siskiyou Co., California, USA
Inside the Obsidian (a not crystallized volcanic glass) a 24x24 mm cavity has formed, and it's occupied for the most part by Cristobalite in crystals. Dark Fayalite's microcrystals are lying on the Cristobalite. Uncommon sample, with original…
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