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Formula: Mg(SO4).H2O
Hydrated normal sulphate, kieserite group, forms a solid solution series with
szomolnokite
Crystal System: Monoclinic
Specific gravity: 2.571 measured, 2.571 calculated
Hardness: 3½
Streak: White
Colour: Colourless, greyish white, yellowish, colourless in transmitted light
Environments
Kieserite occurs typically in marine salt deposits, and rarely as a volcanic sublimate or efflorescence.
Associated minerals include halite,
carnallite, polyhalite,
anhydrite, boracite,
sulfoborite, leonite,
epsomite and celestine
(HOM)
Localities
At the type locality, Stassfurt, Stassfurt Potash deposit, Saxony-Anhalt, Germany, kieserite occurs in a salt
deposit of oceanic origin, associated with halite
(Mindat).
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