- a rare mineral, thorium silicate, ThSiO4, occurring in the form of yellow or black crystals.
Origin of thorite
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for thorite
Determinations of the atomic weight of lead from thorite, a thorium mineral nearly free from uranium, gave 208.4.A Brief Account of Radio-activity
Francis Preston Venable
- a yellow, brownish, or black radioactive mineral consisting of tetragonal thorium silicate. It occurs in coarse granite and is a source of thorium. Formula: ThSiO 4
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