General Information:
Chemical Formula:
CaFe++Si2O6
Composition:
(Molecular Weight = 248.09 gm)
Calcium 16.15 % Ca
Iron 22.51 % Fe
Silicon 22.64 % Si
Oxygen 38.69 % O
Empirical Formula:
CaFe2+Si2O6
Environment:
Contact metasomatic rocks.
IMA Status:
Approved IMA 1987
Locality:
Nordmark, Sweden.
Name Origin:
Named after the Swedish mineralogist, M. A. L. Hedenberg.
Physical Properties:
Cleavage:
[???] Perfect, [???] Indistinct
Color:
brownish green, gray green, grayish black, dark green, or black.
Density:
3.55
Diaphaniety:
Transparent to translucent to opaque
Habits:
Granular - Generally occurs as anhedral to subhedral crystals in matrix., Crystalline - Fine - Occurs as well-formed fine sized crystals., Lamellar - Thin laminae producing a lamellar structure.
Hardness:
5-6 - Between Apatite and Orthoclase
Luminescence:
Non-fluorescent.
Luster:
Vitreous - Pearly
Streak:
white green
More details...