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ettringite

noun et·tring·ite \ ˈe‧triŋˌīt \
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Definition of ettringite

plural -s
: a mineral Ca6Al2(SO4)3(OH)12.26H2O consisting of hydrous basic sulfate of calcium and aluminum

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Origin and Etymology of ettringite

German ettringit, from Ettringen, Rhine Province, Germany, its locality + German -it -ite

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