General Information:
Chemical Formula:
KNa2Li(Fe++,Mn)2Ti2Si8O24
Composition:
(Molecular Weight = 907.69 gm)
Potassium 4.31 % K
Sodium 5.07 % Na
Lithium 0.76 % Li
Titanium 10.55 % Ti
Manganese 3.03 % Mn
Iron 9.23 % Fe
Silicon 24.75 % Si
Oxygen 42.30 % O
Empirical Formula:
KNa2LiFe2+1.5Mn2+0.5Ti2Si8O24
Locality:
Benitoite mine, San Benito, Co., California, USA.
Physical Properties:
Cleavage:
[110] Good
Color:
black or red.
Density:
3.23
Diaphaniety:
Translucent
Habits:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Tabular - Form dimensions are thin in one direction., Crystalline - Coarse - Occurs as well-formed coarse sized cry stals.
Hardness:
5-6 - Between Apatite and Orthoclase
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
brown
More details...