Cassiterite and Quartz with Smoky Quartz Phantoms Jamesonite so the piece is not

so the piece is not 100% pristine

but crystals ON Zinkenite only existed in about 5% of the pieces found

Specimen # BOL711B143

The reverse side of the specimen shows exceedingly rare

Cassiterite and Quartz with Smoky Quartz Phantoms Jamesonite so the piece is notThe Viloco Mine (sometimes called Araca) for many years has stood as one of the top Cassiterite localities in the world. This mine is still active today and 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. This attractive display piece