Cassiterite bi-color Some minor associated Galena can

Some minor associated Galena can be seen on the side of the piece as well

and despite their smaller size

globular group of “Blood Vessel Opal” / Hyalite Opal featuring a group of intergrown “spheres” which get their color from tiny inclusions of iron oxide

Associated minerals include Quartz

outside of the base of the crystal where it detached from the pocket wall

Cassiterite bi-color Some minor associated Galena canCassiterite is rarely seen in faceted stones as the material if often not transparent enough to cut fine stones, plus it requires a skilled cutter to properly handle the brittle material. Bolivia has probably produced more Cassiterite ore than any country in the world. The large majority of the Cassiterite from Viloco is completely opaque and black. Rarely, gem quality crystals are found and those that escape the crusher are prized for their clarity.