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Mineral specimen # :BALD0668
Fayalite on Cristobalite 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) three cavities (22x17 mm, 20x17 mm and 8x7 mm) occupied for the most part by Cristobalite in crystals, have formed. Dark Fayalite in microcrystals lays on the Cristobalite. Uncommon…
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