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[proo-stahyt] /ˈpru staɪt/
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 of proustite
1825-35; named after J. L. Proust; see -ite1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Historical Examples
  • 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.

    Chats in the Book-Room Horace N. Pym
British Dictionary definitions for proustite


a red mineral consisting of silver arsenic sulphide in hexagonal crystalline form. Formula: Ag3AsS3
Word Origin
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
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