Cassiterite (GEM quality!) Sigloite steel grey crystals of this

steel grey crystals of this rare lead

and is not cleaved

but some of the nicest Jamesonite specimens I've seen are from Bolivia

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

Cassiterite (GEM quality!) Sigloite steel grey crystals of thisA 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