Formula: CaAl2(CO3)2(OH)4 . 3H2O
Origin of name: From composition, aluminum, hydro (= water) and calcite (CaCO3)
Crystal system: Triclinic
Crystal class: 1 or -1
Unit cell: a = 6.498 Å, b = 14.457 Å, c = 5.678 Å, a = 95.83°, b = 93.23°, g = 82.24°
Colour: White to pale blue, yellowish, gray, violet
Diaphaneity: Transparent to translucent
Habit: Chalky masses of fibrous crystals
Hardness: 2.5
Specific gravity: 2.23 to 2.40
Cleavage: 2; {100} perfect, {010} imperfect
Streak: White
Synonyms/varieties:
Comments:
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