Hydrous sulphate of magnesia found at the salt mines of Stassfurt, Prussian Saxony.
a white mineral consisting of hydrous magnesium sulfate often found in salt mines
Kieserite is a magnesium sulfate mineral (MgSO4Â·H2O). It has a vitreous luster and it is colourless, greyish-white or yellowish. Its hardness is 3.5 and it has a monoclinic crystal system.