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MgSO4·7H2O A mineral that occurs in clear, needlelike, orthorhombic crystals; commonly, it is massive or fibrous; luster varies from vitreous to milky, hardness is 2-2.5 on Mohs scale, and specific gravity is 1.68; it has a salty bitter taste and is soluble in water. Also known as epsom salt.



(Epsom salt), a mineral of the sulfate class having the molecular formula MgS04-7H20. Epsomite crystallizes in the orthorhombic system, with prismatic or acicular crystals. White or colorless, it has a glassy luster. Epsomite has a hardness of 2 to 2.5 on Mohs’ scale, and it has a density of 1,680 kg/m3. The mineral is soluble in water and has a bitter, salty taste. It is formed by the evaporation of brine from sulfate salt lakes with a high magnesium content. Epsomite has various uses (seeMAGNESIUMSULFATE).

References in periodicals archive ?
381), but also in caves on dripstone and flowstone speleothems composed of calcite, epsomite, goethite, and even mud.
dolomite, epsomite, granite, gypsum, limestone, marble, mica,