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Fayalite, Cristobalite, Obsidian

Locality: Cougar Butte, Cascade Range, Siskiyou Co., California, USA

Clove-brown fayalite crystals on cristobalite in obsidian matrix (see daughter photo for close-up). Cristobalite sphere approximately 28 mm in diameter. Collection and photograph Norman King.

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Photo added: 4th Feb 2011

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