Polihalita
Sign in to savePolyhalite is an evaporite mineral, a hydrated sulfate of potassium, calcium and magnesium with formula: . Polyhalite crystallizes in the triclinic system, although crystals are very rare. The normal habit is massive to fibrous. It is typically colorless, white to gray, although it may be brick red due to iron oxide inclusions. It has a Mohs hardness of 3.5 and a specific gravity of 2.8. It is used as a valuable fertilizer.
Key facts
- Mineral.name
- Polyhalite
- Mineral.image
- History museum of Truskavets 081.jpg
- Mineral.caption
- Museum specimen of polyhalite and anhydrite
- Mineral.category
- Sulfate mineral
- Mineral.IMAsymbol
- Plhl
- Mineral.strunz
- 7.CC.65
- Mineral.system
- Triclinic
- Mineral.class
- Pinacoidal () (same H-M symbol)
- Mineral.symmetry
- F
- Mineral.unit cell
- a = 6.95 Å, b = 8.88 Å, c = 6.95 Å; α = 104.06°, β = 113.94°, γ = 101.15°; Z = 4
- Mineral.color
- Colorless, white, gray; often salmon-pink to brick-red from included iron oxide
- Mineral.habit
- Typically fibrous, foliated, massive; rarely as tabular crystals; pseudo-orthorhombic
- Mineral.twinning
- Characteristically polysynthetic on {010}, {100}
- Mineral.cleavage
- Perfect on {10}; parting on {010}
- Mineral.fracture
- Conchoidal
- Mineral.tenacity
- Brittle
- Mineral.mohs
- 3.5
- Mineral.luster
- Vitreous to resinous
via Wikipedia infobox
Article · Español
La polihalita es un mineral de la clase de los minerales sulfatos. Fue descubierta en 1818 en una mina cerca de Bad Ischl, en la Alta Austria (Austria), siendo nombrada así del griego poli -mucho- y halo -sal-. Sinónimos poco usados son: ischelita, mamanita, poligalita o polihallita.
Abstract from DBpedia / Wikipedia · CC BY-SA