tho rite

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

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