• synonyms


[thawr-ee-uh-nahyt, thohr-]
  1. 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.
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Origin of thorianite

1900–05; thorian (thori(a) + -an) + -ite1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for thorianite

Historical Examples of thorianite

  • The richest known source is thorianite, which consists mainly of thorium oxide, and contains 9.5 cc.

    Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2


  • Much the best practical source of helium is thorianite, a mineral imported from Ceylon for the manufacture of thoria.

British Dictionary definitions for thorianite


  1. a rare black mineral consisting of thorium and uranium oxides. Formula: ThO 2 .U 3 O 8
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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