Blödite

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Blödite specimen - rock identification

What is Blödite?

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). It is found worldwide in evaporitic sedimentary environments such as the Great Salt Lake, Utah.

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Blödite Localities Map

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North ZoneCentral RidgeSouth Basin

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Blödite specimen 2
© Robert M. Lavinsky

Quick Facts

Physical Properties

Color
Colourless, bluish-green, reddish; colourless in transmitted light.
Hardness (Mohs)
2.5 - 3

Chemical Properties

Chemical Formula
Na2Mg(SO4)2 · 4H2O May contain some K replacing Na.
Elements
H, Mg, Na, O, S

Also Known As

BlöditeAstrakaniteMagnesium blodite
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