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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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