General Information:
Chemical Formula:
Ca2(Fe++,Mg)B2Si2O10
Composition:
(Molecular Weight = 365.90 gm)
Calcium 21.91 % Ca
Magnesium 1.66 % Mg
Iron 11.45 % Fe
Silicon 15.35 % Si
Boron 5.91 % B
Oxygen 43.73 % O
Empirical Formula:
Ca2Fe2+0.75Mg0.25B2Si2O10
Locality:
Stoko island, Langesundfiord, southern Norway.
Physical Properties:
Cleavage:
None
Color:
black or blackish brown.
Density:
3.38
Diaphaniety:
Translucent to subtranslucent
Habits:
Tabular - Form dimensions are thin in one direction., ,
Hardness:
5 - Apatite
Luster:
Vitreous (Glassy)
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