Proustite's

proustite

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

Origin:
1825–35; named after J. L. Proust; see -ite1

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proustite (ˈpruːstaɪt)
 
n
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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