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thorianite

noun
tho·​ri·​a·​nite | \ ˈthȯr-ē-ə-ˌnīt How to pronounce thorianite (audio) \

Definition of thorianite

: a strongly radioactive mineral that is an oxide of thorium and often contains rare earth elements

First Known Use of thorianite

1904, in the meaning defined above

History and Etymology for thorianite

irregular from thoria

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