Definition of proustite in English:

proustite

noun

Mineralogy
  • A mineral which is a sulphide of silver and arsenic and usually occurs as masses of prismatic, scarlet crystals.

Origin

Mid 19th century; earliest use found in Charles Shepard (1804–1886). Fromthe name of Joseph Louis Proust, French chemist, who first identified the mineral + -ite, after French proustite (F. S. Beudant Traité élém. de min (ed. 2) II. 445).

Pronunciation

proustite

/ˈpruːstʌɪt/