Stannite with Jamesonite

Item Description

These specimens came out about a year ago, and until recently, their identity wasn't known for sure. From the beginning they were speculated as being Stannite with Jamesonite, and that's what they turned out to be. Most people who are fans of Bolivian minerals are probably familiar with the classic Stannite and Zinkenite association specimens from San Jose that were found circa WWII, but these new specimens are much more rare, and are the only association of Stannite with Jamesonite, that I have seen from any locality. The specimen features several small, sharp, lustrous, metallic, "brass" colored crystals of Stannite sitting atop and mixed with a matrix of bright, metallic, needle-like Jamesonite crystals and are associated with minor gemmy brown Cassiterite. I have photographed the crystals under the microscope to better illustrate their quality. Stannite is copper iron tin sulfide and some of the best pieces of this material come from this mine. This is a very choice specimen of a hard to find association from Bolivia! A unique specimen of these rare minerals.