Cassiterite (GEM quality!) Sigloite The underside is not complete

The underside is not complete where it was removed from the pocket wall

this is a good representative piece

It’s rare to find a pair of intergrown twins like this from Tasna

which hopefully could one day produce specimens of the same size and quality as those from Unificada

steel grey crystals of this rare lead

Cassiterite (GEM quality!) Sigloite The underside is not completeA very impressive and certainly hard to find GEM quality Cassiterite specimen from the famous Viloco Mine. This locality bears the unique distinction of producing the only GEM quality (facet grade) Cassiterites from any mine in Bolivia. Considering the millions of tons of tin ore that Bolivia has yielded, the fact that only one mine ever produced transparent Cassiterite is remarkable. A fine, sharp, lustrous, beautiful, well formed cyclic twinned