pentahydrite
noun
pen·ta·hy·drite
\ˌpentəˈhīˌdrīt\
Definition of pentahydrite
-s
: a mineral MgSO4.5H2O consisting of hydrous sulfate of magnesium isostructural with chalcanthite and containing less water than epsomite
From the M-W Editors
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Origin and Etymology of pentahydrite
penta- + hydr- + -ite
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