Etymology: Named after the place Epsom in England in 1824.<ref>Richard V. Gaines, H. Catherine W. Skinner, Eugene E. Foord, Brian Mason, and Abraham Rosenzweig: Dana's new mineralogy, John Wiley & Sons, 1997</ref><ref>James D. Dana: Dana's System of Mineralogy. Volume II, seventh edition, revised by Charles Palache, Harry Berman, and Clifford Frondel. John Wiley & Sons, 1951</ref>
- (mineralogy) a saline evaporite, consisting of magnesium sulphate, also found in fumaroles
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