Langbeinite is a potassium sulfate with the chemical formula K2Mg2(SO4)3. Langbeinite crystallizes in the isometric -tetartoidal (cubic) system as transparent colorless or white with pale tints of yellow to green and violet crystalline masses. It has a vitreous luster is 3.5 to 4 and the specific gravity is 2.83. The crystals are piezoelectric
The mineral is an ore of potassium and occurs in marine evaporite, halite
It was first described in 1891 for an occurrence in Wilhelmshall, Halberstadt, and named for A. Langbein of Leopoldshall, Germany.
Langbeinite gives its name to the langbeinites , a family of substances with the same cubic structure, a tetrahedral anion, and large and small cations.
Related substances include hydrated salts leonite (K2Mg(SO4)2·4H2O) and picromerite (K2Mg(SO4)2·6H2O).