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Bischofite: MgCl2·6(H2O)
Comments: Colorless grains of bischofite. The mineral is very hygroscopic and must be stored in a closed vial. Location: Stassfurt, Stassfurt Deposit, Saxony-Anhalt, Germany. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag