Blödite
(Redirected from Blodite)
Blödite | |
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![]() Doubly terminated blödite crystal from Soda Lake, San Luis Obispo County, California (size: 7.0 x 4.8 x 1.9 cm) | |
General | |
Category | Sulfate minerals |
Formula (repeating unit) | Na2Mg(SO4)2·4H2O |
IMA symbol | Blö[1] |
Strunz classification | 7.CC.50 |
Crystal system | Monoclinic |
Crystal class | Prismatic (2/m) (same H-M symbol) |
Space group | P21/a |
Unit cell | a = 11.04 Å, b = 8.15 Å, c = 5.49 Å; β = 100.41°; Z = 2 |
Identification | |
Color | Colorless, yellow, may be dark gray, bluish green, or reddish due to inclusions |
Crystal habit | Prismatic to equant crystals, granular, massive |
Fracture | Conchoidal |
Tenacity | Brittle |
Mohs scale hardness | 2.5 - 3 |
Luster | Vitreous |
Specific gravity | 2.23 |
Optical properties | Biaxial (-) |
Refractive index | nα = 1.483, nβ = 1.486, nγ = 1.487 |
Birefringence | δ = 0.004 |
2V angle | 71° (measured) |
References | [2][3][4] |
Blödite or bloedite 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.
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).[3][4]
It is found worldwide in evaporitic sedimentary environments such as the Great Salt Lake, Utah.
See also
References
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ Handbook of Mineralogy
- ^ a b Blödite on Mindat.org
- ^ a b Blödite data on Webmineral
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