Cassiterite
Basin Creek placers, Cataract Mining District, Jefferson County, Montana, USA
4.0 x 3.3 x 1.5 cm. A sculptural and highly unusual, layered nodule of botryoidal, lustrous, rich brown, cassiterite from a very uncommon Montana locality. This variety of cassiterite is called "stream tin", due to the rounded, stream-worn character of the cassiterite. Stream tin was named by Cornish miners from the streams, where the rich ...
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