General Information:
Chemical Formula:
Al2(SO4)(OH)4·7(H2O)
Composition:
(Molecular Weight = 230.13 gm)
Aluminum 11.72 % Al
Hydrogen 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
More details...