One of the mysteries of the English language finally explained.
Anhydrous gypsum (anhydrite) in a crystalline form.
Late 18th century; earliest use found in Richard Kirwan (1733–1812), chemist and mineralogist. From German Muriacit from classical Latin muria + German -it (so called because the mineral was originally thought to be muriated lime); the interpolated -c- is unexplained.
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