Cassiterite (GEM quality!) Sigloite this is a good representative

this is a good representative piece

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

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

and is not cleaved

the piece is in great shape all the way around

Cassiterite (GEM quality!) Sigloite this is a good representativeA 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