Cassiterite is a tin oxide mineral, Sn02, and is generally opaque but sometimes translucent. The best sources of cassiterite are found in the tin mines of Bolivia where they were formed in hydrothermal veins. It sometimes occurs with Arsenopyrite, Pyrite, Tourmaline, and Quartz. The mine of Viloco Araca is the only mine in Bolivia where translucent crystals occur.
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