General Information:
Chemical Formula:
(H3O)Fe+++3(SO4)2(OH)6
Composition:
(Molecular Weight = 480.74 gm)
Iron 34.85 % Fe
Hydrogen 1.89 % H
Sulfur 13.34 % S
Oxygen 49.92 % O
Empirical Formula:
(H3O)Fe3+3(SO4)2(OH)6
IMA Status:
Approved IMA 1960
Physical Properties:
Color:
yellow, dark straw yellow, reddish brown, or brown.
Density:
2.496 - 2.905, Average = 2.7
Diaphaniety:
Transparent to Translucent
Hardness:
4-4.5 - Between Fluorite and Apatite
Luster:
Vitreous - Resinous
More details...