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thorianite

(-nīt′)

noun

a grayish-to-black, very hard, radioactive mineral, thorium dioxide, ThO, that is an ore of thorium

Origin: < thoria + -ite

See thorianite in American Heritage Dictionary 4

noun

A highly radioactive blackish, greenish, or yellow mineral, ThO₂, isomorphous with uraninite.

Origin:

Origin: thoria

Origin: + -an²

Origin: + -ite¹

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