thorite

[thawr-ahyt, thohr-]
noun
a rare mineral, thorium silicate, ThSiO 4 , occurring in the form of yellow or black crystals.

Origin:
1825–35; thor- (as in thoria, thorium) + -ite1, modeled on Swedish thorit

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World English Dictionary
thorite (ˈθɔːraɪt)
 
n
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 10th Edition
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Encyclopedia Britannica
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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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Example sentences
Other ore minerals with higher thorium contents, such as thorite, would be more likely sources if demand significantly increased.
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