Picromerite (synonyms: schoenite, schönite) is a mineral from the class of hydrous Sulfate minerals lacking additional anions, and containing medium to large cations according to the Nickel–Strunz classification.
It is more commonly found in the kainite zones of some marine salt deposits, among them salt mines in Thuringia, Lower Saxony and Saxony-Anhalt (Germany), near Hall in Tirol, Hallstatt and Bad Ischl (Austria), near Whitby (UK), and in the Carlsbad Potash District (New Mexico), also on salt lakes in western China.
Picromerite can also form in sulfate-rich hydrothermal ore deposits and is found in slag heaps of some ore and coal mines.
Picromerite is often accompanied by anhydrite, epsomite, halite, hohmannite, kainite, metasideronatrite and metavoltine, depending on the locality.
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