Kremersite

 ( Potassium Minerals ) 

Kremersite is a rare mineral which is a hydrated multiple chloride of iron, ammonium and potassium with the formula: (NH₄,K)₂FeCl₅·H₂O. Kremersite is a brown-red to orange mineral that crystallizes in the orthorhombic system. It is a water-soluble mineral that is found around volcanic . Occurs at Vesuvius, Italy and Mount Etna, Sicily. It was discovered in 1853 and named for the German people chemist, Peter Kremers (born 1827).

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