General Information:
Chemical Formula:
Na2Fe++5TiSi6O20
Composition:
(Molecular Weight = 861.60 gm)
Sodium 5.34 % Na
Titanium 5.56 % Ti
Iron 32.41 % Fe
Silicon 19.56 % Si
Oxygen 37.14 % O
Empirical Formula:
Na2Fe2+5TiSi6O20
Environment:
Sodalite-syenite rocks.
IMA Status:
Approved IMA 1963
Locality:
TL: Julianehaab district in southern Greenland.
Physical Properties:
Cleavage:
[???] Perfect
Color:
brown or black.
Density:
3.74 - 3.85, Average = 3.79
Diaphaniety:
Opaque
Habits:
Lamellar - Thin laminae producing a lamellar structure., ,
Hardness:
5-6 - Between Apatite and Orthoclase
Luminescence:
Non-fluorescent.
Luster:
Subadamantine
Streak:
reddish brown
More details...