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cassiterite

[kuh-sit-uh-rahyt] /kəˈsɪt əˌraɪt/
noun
1.
a brown or black mineral, tin dioxide, SnO 2 , that crystallizes in the tetragonal system; tinstone: the principal ore of tin.
Origin
1855-1860
1855-60; < Greek kassíter(os) tin + -ite1
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for cassiterite

cassiterite

/kəˈsɪtəˌraɪt/
noun
1.
a black or brown mineral, found in igneous rocks and hydrothermal veins. It is a source of tin. Composition: tin oxide. Formula: SnO2. Crystal structure: tetragonal Also called tinstone
Word Origin
C19: from Greek kassiteros tin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Article for cassiterite

heavy, metallic, hard tin dioxide (SnO2) that is the major ore of tin. It is colourless when pure, but brown or black when iron impurities are present. Commercially important quantities occur in placer deposits, but cassiterite also occurs in granite and pegmatites. Early in the 15th century, the cassiterite veins in Saxony and Bohemia were mined for tin; peak production occurred there in the 17th century. In the 18th and much of the 19th centuries, the very large vein deposits of Cornwall were the major source of tin. Today most of the world's cassiterite is mined in Malaysia, Indonesia, Bolivia, Nigeria, Myanmar (Burma), Thailand, and parts of China; other countries produce smaller amounts. For detailed physical properties, see oxide mineral (table)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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