blödite

Also known as bloedite, astrakhanite, astrakanite

Blödite or bloedite is a hydrated sodium magnesium sulfate mineral with the formula Na2Mg(SO4)2·4H2O. The mineral is clear to yellow in color often darkened by inclusions and forms monoclinic crystals.

Key facts

Mineral.name: Blödite
Mineral.category: Sulfate minerals
Mineral.image: Blodite-162510.jpg
Mineral.imagesize: 260px
Mineral.caption: Doubly terminated blödite crystal from Soda Lake, San Luis Obispo County, California (size: 7.0 × 4.8 × 1.9 cm)
Mineral.formula: Na2Mg(SO4)2·4H2O
Mineral.IMAsymbol: Blö
Mineral.strunz: 7.CC.50
Mineral.system: Monoclinic
Mineral.class: Prismatic (2/m) (same H-M symbol)
Mineral.symmetry: P21/a
Mineral.unit cell: a = 11.04 Å, b = 8.15 Å, c = 5.49 Å; β = 100.41°; Z = 2
Mineral.color: Colorless, yellow, may be dark gray, bluish green, or reddish due to inclusions
Mineral.habit: Prismatic to equant crystals, granular, massive
Mineral.fracture: Conchoidal
Mineral.tenacity: Brittle
Mineral.mohs: 2.5–3
Mineral.luster: Vitreous

via Wikipedia infobox

Wikidata facts

Image: Blödit - San Luis Obispo, Californien.jpg

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Nickel-Strunz 9th edition (updated 2009): 7.CC.50
Nickel-Strunz '10th ed', review of (9th ed/ 2009 update): 7.CC.50
Commons category: Blödite
IMA Mineral Symbol: Blö
chemical formula: Na₂Mg(SO₄)₂·4H₂O
Strunz 8th edition (series ID, updated): VI/C.11

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Blödite was first described in 1821 for an occurrence in a salt deposit in Ischler Salzberg, Bad Ischl, Gmunden, Austria and named for German mineralogist and chemist Karl August Blöde (1773–1820).