Polyhalite 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
Article · 中文
杂卤石（Polyhalite）是一种蒸发岩矿物，为钾、钙、镁水合硫酸盐，分子式 K2Ca2Mg(SO4)4·2H2O。杂卤石在三斜晶系中结晶，但晶体非常罕见。正常性状是块体到纤维状，通常为无色，或白、灰色，有时因夹杂氧化铁而可能显示出砖红色。其莫氏硬度为3.5，比重2.8。 它产于沉积海相蒸发岩中，是新墨西哥州卡尔斯巴德矿床中的一种主要钾矿石。 1818年，奥地利萨尔茨堡多卤石典型产地的标本被首次予以记录，多卤石的名称来自德语“Polyhalit”，引用古希腊单词"πολύς"（'polys'）和"ἅλς”（“hals”），意思是“许多”和“盐”，德语词尾“it”（来自拉丁语词尾“ites”，最初也出自希腊语），它与英语词尾“ite”一样用于构成某些化合物的名称。 希腊单词“多盐”在杂卤石中的使用缘于杂卤石是由数种金属组成，这些金属在化学中可形成更普遍意义上的盐。
Abstract from DBpedia / Wikipedia · CC BY-SA