Epsomite, Epsom salt, or magnesium sulfate heptahydrate, is a hydrous magnesium sulfate mineral with formula MgSO4·7H2O. Epsomite crystallizes in the orthorhombic system. The normal form is as massive encrustations, while acicular or fibrous crystals are rarely found. It is colorless to white with tints of yellow, green and pink.

Epsomite Group; Epsomite-Morenosite Series; Epsomite-Goslarite Series. A complete series exists to Morenosite and to Goslarite. Usually found as crusts, delicate efflorescences, or botryoidal masses of tiny fibrous to acicular crystals, its color is white but it is often stained a variety of pale hues by impurities.

epsomite, a common sulfate mineral, hydrated magnesium sulfate (MgSO 4 ·7H 2 O). Its deposits are formed by evaporation of mineral waters, as at Epsom, Surrey, Eng., where it was discovered in 1695. It also is found as crusts and efflorescences in coal or metal mines, in limestone caves, and in the oxidized zones of sulfide ore deposits.

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Epsomite is an important industrial mineral. It is chiefly used for the production of epsom salts. It is also used in the preparation of pharmaceutical products, for the production of paper and sugar, and as dying material. Epsomite was found as crusts produced by thermal springs in Epsom, Surrey, England, which is the locality it is named after.

Epsomite ， Epsom盐或硫酸镁是含水液，是一种含水 硫酸镁矿物质，配方 MGSO 4 ·7H 2 O。 epsomite在 正骨 系统中结晶，因为很少发现的粘膜或纤维晶体，正常形式是巨大的包裹。

化学名： 硫酸镁，或 七水硫酸镁，又名硫苦、苦盐、 泻利盐，是一种含镁的化合物。 七水硫酸镁在空气（干燥）中易风化为粉状，加热时逐渐脱去 结晶水 变为 无水硫酸镁， 分子式 为 MgSO4 （或MgSO4·7H2O），硫酸镁是一种化工原料。 无水的硫酸镁是一种常用的 化学试剂 及干燥试剂。 但是硫酸镁常指七水硫酸镁，因为它不容易吸潮，比无水硫酸镁更容易称量，便于在工业中进行的定量控制。 溶解度：易溶于水， 微溶 于 乙醇 和甘油。 150℃时失去6个 结晶水，生成 硫 …

Lake-bed deposits on Kruger Mountain, Oregon. Link to MinDat.org Location Data. The mineral has long been known from the deposits associated with the mineral waters at Epsom, Surrey, England. Comments: Pure white compact fibrous mass of epsomite. Location: Calatayud, Zaragoza, Aragon, Spain. Scale: See Photo.

Epsomite, or heptahydrite as it is known in chemistry circles, is one of only a few water soluble sulfate minerals. It is actually well known in most households as the artificially created epsom salt. Magnesium sulfate's medicinal uses were discovered from mineral waters at Epsom, England from where epsom salt and epsomite get their names.

Occurrence: As efflorescences on the walls of mines, caves, and outcrops of sulfide-bearing magnesian rocks; a product of evaporation at mineral springs and saline lakes; a hydration product of kieserite and langbeinite; rarely a fumarolic sublimate.