General Information:
Chemical Formula:
Ca6(Cr,Al)2(SO4)3(OH)12·26(H2O)
Composition:
(Molecular Weight = 1,292.63 gm)
Calcium 18.60 % Ca
Aluminum 1.04 % Al
Chromium 6.03 % Cr
Hydrogen 4.99 % H
Sulfur 7.44 % S
Oxygen 61.89 % O
Empirical Formula:
Ca6Cr1.5Al0.5SO43(OH)12·26(H2O)
IMA Status:
Approved IMA 1980
Physical Properties:
Cleavage:
[1010] Perfect
Color:
violet or light violet.
Density:
2.025
Diaphaniety:
Transparent
Hardness:
2 - Gypsum
Luster:
Vitreous (Glassy)
Streak:
violet
More details...