Parabutlerite

General Information:
 Chemical Formula:
Fe+++(SO4)(OH)·2(H2O)
 Composition:
(Molecular Weight = 204.95 gm)
Iron 27.25 % Fe
Hydrogen 2.46 % H 
Sulfur 15.65 % S 
Oxygen 54.65 % O 
 Empirical Formula:
Fe3+(SO4)(OH)·2(H2O)
Physical Properties:
 Cleavage:
[110] Indistinct
 Color:
light brown orange, light orange, or orange brown.
 Density:
2.55
 Diaphaniety:
Transparent
 Hardness:
2.5 - Finger Nail
 Luster:
Vitreous (Glassy)
 Streak:
light yellow
More details...