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thorianite

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thorianite [′thȯr·ē·ə‚nīt]
(mineralogy)
ThO2A radioactive mineral that crystallizes in the isometric system, occurs in worn cubic crystals, is brownish black to reddish brown in color, and has resinous luster; hardness is 7 on the Mohs scale, and specific gravity is 9.7-9.8.
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has perhaps the world's largest mineable deposit of the primary thorium minerals, thorite and thorianite.
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It must be noted that the Idaho and Montana deposits are of high-grade thorite and thorianite rather than low-grade disseminated deposits as in India, for example.
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An intense program of stripping, trenching, geology and approximately 40,000 feet of diamond drilling was completed between 1953 and 1957 resulting in the delineation of a body of fluorite, yellow mica, uraniferous thorianite, uranothorite, chondrodite and monazite within a calcareous marble.
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