Langbeinite
A variety of Langbeinite Group
What is Langbeinite?
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. It was first described in 1891 for an occurrence in Wilhelmshall, Halberstadt, Saxony-Anhalt, Germany, 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).
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Langbeinite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Langbeinite Localities Map
See where Langbeinite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Colorless, white, pale tinges, colourless in transmitted light
- Hardness (Mohs)
- 3.5 - 4
- Density
- 2.77 g/cm³
- Streak
- White
Chemical Properties
- Chemical Formula
- K2Mg2(SO4)3
- Elements
- K, Mg, O, S
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Langbeinite FAQs
How do I identify Langbeinite?
Langbeinite can be identified by its hardness of 3.5 - 4 on the Mohs scale, Colorless color. Look for these key characteristics when examining specimens.
What color is Langbeinite?
Langbeinite typically appears in Colorless, white, pale tinges, colourless in transmitted light. Color can vary depending on impurities and formation conditions.
How hard is Langbeinite?
Langbeinite has a hardness of 3.5 - 4 on the Mohs scale. This gives it moderate hardness.