langbeinite
Sign in to saveLangbeinite is a potassium magnesium sulfate mineral 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. The Mohs hardness is 3.5 to 4 and the specific gravity is 2.83. The crystals are piezoelectric.
Key facts
- Mineral.name
- Langbeinite
- Mineral.image
- File:Langbeinite-553833.jpg
- Mineral.imagesize
- 260px
- Mineral.category
- Sulfate mineral
- Mineral.formula
- K2Mg2(SO4)3
- Mineral.IMAsymbol
- Lbn
- Mineral.strunz
- 7.AC.10
- Mineral.system
- Cubic
- Mineral.class
- Tetartoidal (23) (same H-M symbol)
- Mineral.symmetry
- P213
- Mineral.unit cell
- a = 9.92 Å; Z = 4
- Mineral.color
- Colorless with pale shades of yellow, pink, red, green, gray
- Mineral.habit
- As nodules, disseminated grains, bedded massive
- Mineral.fracture
- Conchoidal
- Mineral.tenacity
- Brittle
- Mineral.mohs
- 3.5–4
- Mineral.luster
- Vitreous
- Mineral.diaphaneity
- Transparent
via Wikipedia infobox
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Encyclopedic overview
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Langbeinite is a potassium magnesium sulfate mineral 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. The Mohs hardness 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 deposits in association with carnallite, halite, and sylvite.
Excerpted from Wikipedia’s “langbeinite” article, available under the CC BY-SA 4.0 licence.