Anhydrite

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Anhydrite (anhydrous calcium sulfate, CaSO4) is a very close cousin of gypsum - which is hydrous - CaSO4-2H20. Gypsum or "selenite" is of course the more famous of these cousins from Naica, but the locality has also produced very pretty anhydrite specimens, such as this "Chrysler Building" style specimen of pretty dove-grey. Ex. Stoudt Collection.