kieserite

A whitish to yellowish hydrous magnesium sulfate mineral, MgSO₄·H₂O, found in salt residues.

A hydrated sulphate of magnesium, occurring in considerable beds with rock-salt at Stass-furt, Prussia, and elsewhere.

Hydrous sulphate of magnesia found at the salt mines of Stassfurt, Prussian Saxony.

A saline evaporite, consisting of hydrated magnesium sulphate

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