Jervisite

General Information:
 Chemical Formula:
(Na,Ca,Fe++)(Sc,Mg,Fe++)Si2O6
 Composition:
(Molecular Weight = 223.42 gm)
Sodium 6.17 % Na
Calcium 5.38 % Ca
Magnesium 3.26 % Mg
Scandium 12.07 % Sc
Iron 5.00 % Fe
Silicon 25.14 % Si
Oxygen 42.97 % O 
 Empirical Formula:
Na0.6Ca0.3Fe2+0.2Sc0.6Mg0.3Si2O6
 IMA Status:
Approved IMA
Physical Properties:
 Cleavage:
[110] Perfect
 Color:
light green.
 Density:
3.22
 Diaphaniety:
Transparent to Translucent
 Hardness:
6-7 - Orthoclase-Quartz
 Luster:
Vitreous (Glassy)
 Streak:
white
More details...