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Splendid Ettringite

Ettringite
Photo © Saphira Minerals

Ettringite

Ettringite is a hydrous calcium aluminium sulfate mineral. It is a colorless to yellow mineral crystallizing in the trigonal system. The prismatic crystals are typically colorless, turning white on partial dehydration.

Formula: Ca₆Al₂(SO₄)₃(OH)₁₂·26H₂O
System:Trigonal
Colour:Colourless; colourless ...
Hardness:2 - 2½

Locality: N'Chwaning Mines, Kuruman, Kalahari manganese field, Northern Cape Province, South Africa

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