General Information:
Chemical Formula:
(Fe,Mn)SiO3,Fe+++2Si2O7·2(H2O)
Composition:
(Molecular Weight = 315.89 gm)
Iron 35.36 % Fe
Silicon 17.78 % Si
Hydrogen 1.28 % H
Oxygen 45.58 % O
Empirical Formula:
Fe3+2Si2O7·2(H2O)
Locality:
Riddarhyttan, Vastmanland, Sweden.
Name Origin:
Named for Wilhelm Hisinger (1766-1852), eminent chemist.
Physical Properties:
Cleavage:
None
Color:
brownish black or black.
Density:
2.5 - 3, Average = 2.75
Diaphaniety:
Subtransparent to opaque
Habits:
Acicular - Occurs as needle-like crystals., Massive - Uniformly indistinguishable crystals forming large masses., Compact - Occurs as a compact mass.
Hardness:
3 - Calcite
Luminescence:
Non-fluorescent.
Luster:
Greasy (Oily)
Streak:
yellowish brown
More details...