General Information:
Chemical Formula:CaFe++Si2O6
Composition:(Molecular Weight = 248.09 gm)Calcium 16.15 %
CaIron 22.51 %
FeSilicon 22.64 %
SiOxygen 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
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