Cassiterite var. Stream Tin

Item Description

A sculptural and highly unusual, grape-like cluster of botryoidal, brownish-black cassiterite from a very uncommon Mexico locality. The botryoids are lustrous on this pristine floater. 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 deposits were first found in Cornwall. This is excellent, old-time and rare material.