Tags: Chemical Substance, Mineral.

Ettringite is a hydrous calcium aluminium sulfate mineral with formula: Ca6Al2(SO4)3(OH)12·26H2O. It is a colorless to yellow mineral crystallizing in the trigonal system. The prismatic crystals are typically colorless turning white on partial dehydration. It is part of the ettringite-group which includes other sulfates such as thaumasite and bentorite.

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