epsomite

noun
ep·​som·​ite | \ˈepsəˌmīt\
plural -s

Definition of epsomite 

: a mineral MgSo4.7H2O consisting of native Epsom salts usually occurring massive or in crusts (hardness 2.0–2.5, specific gravity 1.75)

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History and Etymology for epsomite

French, from Epsom, England, its locality + French -ite

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