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Langbeinite in the History Museum, Truskavets
|Crystal class||Tetartoidal (23) |
(same H-M symbol)
|Unit cell||a = 9.92 Å; Z = 4|
|Color||Colorless with pale shades of yellow, pink, red, green, gray|
|Crystal habit||As nodules, disseminated grains, bedded massive|
|Mohs scale hardness||3.5 - 4|
|Refractive index||n = 1.5329–1.5347|
|Solubility||Slowly dissolves in water|
Langbeinite is a potassium magnesium sulfate mineral with the chemical formula K2Mg2(SO4)3. Langbeinite crystallizes in the isometric-tetartoidal system as transparent colorless or white with pale tints of yellow to green and violet crystalline masses. It has a vitreous luster. The Mohs hardness is 3.5 to 4 and the specific gravity is 2.83. The crystals are piezoelectric.
Langbeinite gives its name to the langbeinites, a family of substances with the same cubic structure, a tetrahedral anion, and large and small cations.
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