General Information:
Chemical Formula:
Fe+++(SO4)(OH)·5(H2O)
Composition:
(Molecular Weight = 258.99 gm)
Iron 21.56 % Fe
Hydrogen 4.28 % H
Sulfur 12.38 % S
Oxygen 61.78 % O
Empirical Formula:
Fe3+(SO4)(OH)·5(H2O)
Name Origin:
From the Latin, fibra, meaning "fibre" and ferrum, meaning "iron."
Physical Properties:
Cleavage:
[001] Perfect
Color:
green gray, yellow green, white, light green, or light yellow.
Density:
1.9
Habits:
Fibrous - Crystals made up of fibers., Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite), Massive - Fibrous - Distinctly fibrous fine-grained for ms.
Hardness:
2 - Gypsum
Luster:
Silky
Streak:
white
More details...