What is "kieserite"

Kieserite \Kie"ser*ite\, n. [Named after Prof. Kieser, of Jena.] (Min.) Hydrous sulphate of magnesia found at the salt mines of Stassfurt, Prussian Saxony.

n. (context mineralogy English) A saline evaporite, consisting of hydrated magnesium sulphate

n. a white mineral consisting of hydrous magnesium sulfate often found in salt mines

Kieserite is the magnesium sulfate mineral (MgSO·HO) and is named after Dietrich Georg von Kieser (Jena, Germany 1862). It has a vitreous luster and it is colorless, grayish-white or yellowish. Its hardness is 3.5 and crystallizes in the monoclinic crystal system. Gunningite is the zinc member of the kieserite group of minerals.