One of the mysteries of the English language finally explained.
A mineral which is a sulphide of silver and arsenic and usually occurs as masses of prismatic, scarlet crystals.
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).
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