General Information:
Chemical Formula:
(Fe++,Mg,Ni)(Cr,Al)2(SO4)4·22(H2O)
Composition:
(Molecular Weight = 918.74 gm)
Magnesium 0.79 % Mg
Aluminum 1.47 % Al
Chromium 8.49 % Cr
Iron 3.65 % Fe
Nickel 0.64 % Ni
Hydrogen 4.83 % H
Sulfur 13.96 % S
Oxygen 66.17 % O
Empirical Formula:
Fe2+0.6Mg0.3Ni0.1Cr1.5Al0.5(SO4)4·22(H2O)
Locality:
Redington mine, Knoxville, Napa Co., California.
Name Origin:
Named after it's locality.
Physical Properties:
Color:
white, light violet, or light purple.
Density:
1.761
Diaphaniety:
Transparent
Habits:
Fibrous - Crystals made up of fibers., ,
Hardness:
2 - Gypsum
Luminescence:
Non-fluorescent.
Luster:
Silky
Streak:
white
More details...