proustite

noun
proust·ite | \ ˈprü-ˌstīt \

Definition of proustite 

: a mineral that consists of a red sulfide of silver and arsenic and occurs in crystals or massively

First Known Use of proustite

1835, in the meaning defined above

History and Etymology for proustite

French, from Joseph L. Proust †1826 French chemist

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The first known use of proustite was in 1835

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