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ettringite

noun
et·tring·ite | \ˈe‧triŋˌīt\
plural -s

Definition of ettringite 

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

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History and Etymology for ettringite

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

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