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Mineral specimen # :BALD0375
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), a 8x11 mm cavity, entirely occupied by Cristobalite, has formed.
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