pentahydrite

noun
pen·​ta·​hy·​drite | \ˌpentəˈhīˌdrīt\
plural -s

Definition of pentahydrite 

: a mineral MgSO4.5H2O consisting of hydrous sulfate of magnesium isostructural with chalcanthite and containing less water than epsomite

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History and Etymology for pentahydrite

penta- + hydr- + -ite

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