Langbeinite
Mineral K2Mg2(SO4)3
Take care.
- Damaged by water: Keep it dry: don't wash it, and keep it out of damp places.
About it
A potash ore mineral with no good cleavage, which helps tell it from halite and sylvite in the same beds. Mined at Carlsbad, New Mexico, for potassium-magnesium fertilizer.
- Type
- Mineral
- Group
- Sulfate, anhydrous
- Formula
- K2Mg2(SO4)3
- Hardness (Mohs)
- 3.5–4
- Specific gravity
- 2.8–2.85
- Streak
- white
- Lustre
- vitreous (glassy)
- Crystal system
- Isometric (cubic)
- Colours
- colourless, white, grey, pink, yellowish, greenish
- Transparency
- transparent, translucent
- Cleavage and fracture
- none; conchoidal fracture
Typical values: real specimens vary. For more, see mindat.org.