Crystal structure of kieserite - MgSO4·H2O). Hawthorne F C, Groat L A, Raudsepp M, Ercit T S — Photo: MarinaVladivostok · CC0
Kieserite
Magnesium sulfate monohydrate — a colorless-to-yellowish evaporite mineral mined for magnesium and sulfur.
Intro adapted from Wikipedia (CC BY-SA).
Kieserite is an IMA-recognized mineral species in the sulfate class, with the chemical formula Mg(SO₄)·H₂O.
It crystallizes in the monoclinic crystal system (space group C2/c). It is a member of the Kieserite structural group.
Key properties: Mohs hardness 3.5; specific gravity 2.571; typically white or colorless or gray or yellow; white streak; Vitreous luster; refractive index 1.546; optically biaxial.
IMA symbol Ksr, IMA status: approved, named in 1861.
is typically found in marine salt deposits; rarely as a volcanic sublimate or efflorescence.
It is found associated with Halite, carnallite, polyhalite, anhydrite, boracite, sulfoborite, leonite, epsomite, celestine.
The mineral was named to honor Dietrich Georg Kieser (1779–1862), President, Jena Academy, Jena, Germany.
Collections: Everyday Minerals.