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[thawr-ahyt, thohr-] /ˈθɔr aɪt, ˈθoʊr-/
a rare mineral, thorium silicate, ThSiO 4 , occurring in the form of yellow or black crystals.
1825-35; thor- (as in thoria, thorium) + -ite1, modeled on Swedish thorit Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for thorite
  • Other ore minerals with higher thorium contents, such as thorite, would be more likely sources if demand significantly increased.
British Dictionary definitions for thorite


a yellow, brownish, or black radioactive mineral consisting of tetragonal thorium silicate. It occurs in coarse granite and is a source of thorium. Formula: ThSiO4
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Article for thorite

thorium silicate, ThSiO4, one of the most important thorium minerals. Almost always altered by hydration, it occurs in syenite near Brevik, Nor., and in the gem gravels of Sri Lanka. Thorite is mined commercially in the United States at Cripple Creek, Colo., and at Hall Mountain, Idaho. Although the mineral is usually light brown, an orange-yellow gem variety known as orangite occurs in Madagascar. For detailed physical properties, see silicate mineral (table)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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