Editing Anhydrite (section)

==Naming history==
The name anhydrite was given by [[A. G. Werner]] in 1804, because of the absence of water of crystallization, as contrasted with the presence of water in gypsum. Some obsolete names for the species are muriacite and karstenite; the former, an earlier name, being given under the impression that the substance was a chloride (muriate). A peculiar variety occurring as contorted concretionary masses is known as tripe-stone, and a scaly granular variety, from [[Costa Volpino|Volpino]], near [[Bergamo]], in [[Lombardy]], as vulpinite; the latter is cut and polished for ornamental purposes.

A semi-transparent light blue-grey variety from [[Peru]] is referred to by the trade name ''angelite''.<ref>{{cite web|url=http://www.mindat.org/min-232.html|title=Angelite|website=Mindat.org}}</ref>