[ proo-stahyt ]
/ ˈpru staɪt /

noun Mineralogy.

a mineral, silver arsenic sulfide, Ag3AsS3, occurring in scarlet crystals and masses: a minor ore of silver; ruby silver.

Origin of proustite

1825–35; named after J. L. Proust; see -ite1 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for proustite

  • I might possibly offer to change some of the locally interesting ones for a proustite, but I can't afford any more cash just now.

British Dictionary definitions for proustite

/ (ˈpruːstaɪt) /


a red mineral consisting of silver arsenic sulphide in hexagonal crystalline form. Formula: Ag 3 AsS 3

Word Origin for proustite

C19: from French, named after Joseph Louis Proust (1754–1826), French chemist
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012