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Splendid Ettringite

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
Dimensions: 4 mm x 2.1 mm x 1.2 mm

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