|Crystal symmetry||Monoclinic prismatic
H-M symbol: (2/m)
Space group: P 21/a
|Unit cell||a = 11.04 Å, b = 8.15 Å, c = 5.49 Å; β = 100.41°; Z=2|
|Color||Colorless, yellow, may be dark gray, bluish green, or reddish due to inclusions|
|Crystal habit||Prismatic to equant crystals, granular, massive|
|Mohs scale hardness||2.5 - 3|
|Optical properties||Biaxial (-)|
|Refractive index||nα = 1.483, nβ = 1.486, nγ = 1.487|
|Birefringence||δ = 0.004|
|2V angle||71° (measured)|
Blödite is a hydrated sodium magnesium sulfate mineral with formula: Na2Mg(SO4)2·4H2O. The mineral is clear to yellow in color often darkened by inclusions and forms monoclinic crystals. A synonym for the mineral is bloedite (German umlaut can be written as an "e" addition).
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).
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