General Information:
Chemical Formula:
(Fe++,Fe+++)2-3Si2O5(OH)4
Composition:
(Molecular Weight = 315.89 gm)
Iron 35.36 % Fe
Silicon 17.78 % Si
Hydrogen 1.28 % H
Oxygen 45.58 % O
Empirical Formula:
Fe2+Fe3+Si2O5(OH)4
Physical Properties:
Cleavage:
None
Color:
blue green, light yellow green, dark green, or black.
Density:
2.85 - 3.15, Average = 3
Diaphaniety:
Translucent to Subopaque
Hardness:
2.5 - Finger Nail
Luster:
Earthy (Dull)
Streak:
greenish gray
More details...