PROUSTITE

Etymology

Noun

proustite (usually uncountable, plural proustites)

(mineral) A mineral, Ag₃AsS₃, often found with pyrargyrite in silver veins.

Source: Wiktionary

Proust"ite, n. Etym: [From the French chemist, J. L. Proust.] (Min.)

Definition: A sulphide of arsenic and silver of a beautiful cochineal-red color, occurring in rhombohedral crystals, and also massive; ruby silver.

Source: Webster’s Unabridged Dictionary 1913 Edition

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