noun Mineralogy.
a mineral, silver arsenic sulfide, Ag 3 AsS 3 , occurring in scarlet crystals and masses: a minor ore of silver; ruby silver.

1825–35; named after J. L. Proust; see -ite1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
proustite (ˈpruːstaɪt)
a red mineral consisting of silver arsenic sulphide in hexagonal crystalline form. Formula: Ag3AsS3
[C19: from French, named after Joseph Louis Proust (1754--1826), French chemist]

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