General Information:
Chemical Formula:
Na2Fe++4Fe+++2Si6O20
Composition:
(Molecular Weight = 869.56 gm)
Sodium 5.29 % Na
Iron 38.53 % Fe
Silicon 19.38 % Si
Oxygen 36.80 % O
Empirical Formula:
Na2Fe2+4Fe3+2Si6O20
IMA Status:
Approved IMA
Physical Properties:
Color:
black.
Diaphaniety:
Subtransparent to Opaque
Hardness:
5 - Apatite
Luster:
Vitreous (Glassy)
Streak:
brown
More details...