epsomite

[ep-suh-mahyt]
noun Mineralogy.
the natural form of Epsom salt, Mg 2 SO 4 ⋅7H 2 O, found as a crust in caves and lake deposits.

Origin:
1805–15; named after Epsom; see -ite1

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Encyclopedia Britannica
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epsomite

a common sulfate mineral, hydrated magnesium sulfate (MgSO47H2O). 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. The purified compound is used in medicine as Epsom salts. For detailed physical and mineralogic properties, see sulfate mineral (table)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Not yet identified but might he expected as dehydration product of epsomite in chloride zone on floodplains.
Have the students compare and contrast the halite and the epsomite crystals.
Thin flexible filaments of gypsum or epsomite projecting from a cave wall.
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