Phenakite, Quartz (Var: Smoky Quartz), Topaz

Locality: Upper Cramer Lake, Sawtooth Batholith/Sawtooth Mts, Custer Co., Idaho, USA

A prismatic, colorless phenakite crystal, on matrix of smoky quartz crystals and an odd topaz crystal, which exhibits a "cast" of some mineral that formerly occupied the space (beryl?).Other topaz from this miarolitic cavity also exhibited "casts". Found above Upper Cramer Lake, Custer County, Idaho. Overall size of specimen 2.8 x 1.9 x 1.1 cm. Self-collected.

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Photo added: 21st May 2008

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