Cassiterite - MSN Encarta

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Cassiterite - Wikipedia, the free encyclopedia
Cassiterite is a tin oxide mineral, SnO 2. It is generally opaque, but is translucent in thin crystals. Its luster and multiple crystal faces produce a desirable gem.
cassiterite - Hutchinson encyclopedia article about cassiterite
cassiterite. Mineral consisting of reddish-brown to black stannic oxide (SnO 2), usually found in granite rocks. It is the chief ore of tin. When fresh it has a bright ...
Category:Cassiterite - Wikimedia Commons
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Cassiterite, also tinstone, mineral consisting of tin dioxide (SnO₂). It forms crystals in the tetragonal system and has a hardness of 6 to 7 on the Mohs scale and a relative density of 7. Usually dark brown to black, it has a dull adamantine lustre. Cassiterite is the only commercially important ore of tin. It has been mined in Cornwall, England, since ancient times (and traded then to Phoenicians and Romans), but the principal sources today are Bolivia, the Malay Peninsula, Indonesia, Nigeria, and the Republic of Congo.