Evaporite rock from the Permian of New Mexico, USA. (collected in 1958)
Evaporites are chemical sedimentary rocks that form by the evaporation of water and the precipitation of dissolved minerals. Rock salt and rock gypsum are the two most common evaporites. This polymineralic evaporite rock is composed of reddish-colored ferruginous sylvite (KCl - potassium chloride with iron oxide), halite (NaCl - sodium chloride), carnallite (KMgCl3·6H2O - hydrous potassium magnesium chloride), and polyhalite (K2Ca2Mg(SO4)4·2H2O - hydrous potassium calcium magnesium sulfate).
Stratigraphy: Salado Formation, Upper Permian
Locality: Southwest Potash Mine (= Amax Mine; = Horizon Potash Mine), Carlsbad Potash Mining District, Eddy County, New Mexico, USA
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