Cristobalite and Fayalite Obsidian
Cougar Butte occurrence (Canyon Butte; Couger Butte), Cougar Butte, Cascade Range, Siskiyou Co., California, USA
59 x 37 x 38mm

Inside the Obsidian (a not crystallized volcanic glass) some cavities the (biggest is 17x17 mm), occupied for the most part by Cristobalite in crystals, have formed. One Fayalite's crystal lays on the Cristobalite. Uncommon sample, wit (Silvia Gallery)
Reference:BALD0502
minID: 648-EWY

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