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Specimen # BOL711B129
Associated minerals include Quartz
Some minor associated Galena can be seen on the side of the piece as well
lustrous Brookite crystals with squared-off terminations sitting beautifully on Quartz matrix
Cassiterite bi-color Specimen # BOL711B129Cassiterite 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.
