One of the mysteries of the English language finally explained.
A variety of opal containing lime and alumina as impurities.
Mid 19th century; earliest use found in Charles Shepard (1804–1886). From German Alumocalcit (A. Breithaupt Vollständige Charakteristik des Mineral-Syst (ed. 3, 1832) 97; from alum- (in † Alumina) + -o- + classical Latin calc-, calx lime + German -it), with remodelling of the ending after words in -ite.
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