One of the mysteries of the English language finally explained.
A black, lustrous, brittle mineral consisting of a sulphide of silver and arsenic, Ag₁₆As₈S₁₁, occurring as tabular crystals of the monoclinic system and usually containing copper in place of some of the silver.
Late 19th century. From the name of Richard Pearce, British-born metallurgist and chemist + -ite.
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