Formula: Ca6 Al2(SO4)3(OH)12 . 26H2O
Origin of name: Locality; Ettringen, Germany
Crystal system: Hexagonal
Crystal class: 3m
Twinning:
Unit cell:
Colour: Colourless, milky white
Diaphaneity: Transparent
Luster: Vitreous
Habit: Flattened hexagonal dipyramids; prismatic; fibrous
Hardness: 2 to 2.5
Specific gravity: 1.77
Cleavage: 1; {10-10} perfect
Tenacity:
Streak:
Synonyms/varieties: Woodfordite (SiO2, CO2-rich var.)
Comments:
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