noun Mineralogy.

the natural form of Epsom salt, Mg2SO4⋅7H2O, found as a crust in caves and lake deposits.

Origin of epsomite

1805–15; named after Epsom; see -ite1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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Historical Examples of epsomite