پلی هالیت
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
Wikidata facts
- Subclass of
- sulfate mineral
- Named after
- salt
- Image
- Polyhalite-784531.jpg
Show 8 more facts
- Commons category
- Polyhalite
- Nickel-Strunz 9th edition (updated 2009)
- 7.CC.65
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 7.CC.65
- streak color
- white
- crystal system
- triclinic crystal system
- IMA Mineral Symbol
- Plhl
- chemical formula
- K₂Ca₂Mg(SO₄)₄·2H₂O
- Strunz 8th edition (series ID, updated)
- VI/C.14
Sources (1)
via Wikidata · CC0