thorianite

[thawr-ee-uh-nahyt, thohr-]
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noun

a rare mineral, mainly thoria, ThO2, but also containing uranium, cerium, and other rare-earth metals, occurring in small, black, cubic crystals: notable for its radioactivity and used as a minor source of thorium.

Origin of thorianite

1900–05; thorian (thori(a) + -an) + -ite1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for thorianite

thorianite

noun

a rare black mineral consisting of thorium and uranium oxides. Formula: ThO 2 .U 3 O 8
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012