Formula: Mg(SO4.7H2O sulphate
Specific gravity: 1.68
Hardness: 2 to 2½
Streak: White
Colour: White, sometimes greenish, reddish, yellowish
Solubility: Effloresces in dry air. Very soluble in water.

Hot spring deposits
Hydrothermal environments

Epsomite occurs as an efflorescence on the rocks in mine workings and on the walls of caves. It occurs as deposits in salt springs and ore bodies, deposits in salt lakes and in arid regions in blueschist facies rocks.

Common impurities: Ni,Fe,Co,Mn,Zn

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