General Information:
Chemical Formula:Al2(SO4)(OH)4·7(H2O)
Composition:(Molecular Weight = 230.13 gm)Aluminum 11.72 %
AlHydrogen 4.82 %
H Sulfur 13.93 %
S Oxygen 69.52 %
O Empirical Formula: Al(SO4)(OH)·5(H2O)
Name Origin:Named after its chemical composition.
Physical Properties: Cleavage:None
Color:white or grayish white.
Density:1.66 - 1.7, Average = 1.68
Diaphaniety:Opaque
Habits:Mammillary - Larger "breast-like" rounded forms resembling botryoidal (e.g. malachite)., Botryoidal - "Grape-like" rounded forms (e.g.. malachite)., Earthy - Dull, clay-like texture w ith no visible crystalline affinities, (
Hardness:1 - Talc
Luminescence:Fluorescent.
Luster:Earthy (Dull)
Streak:white
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