General Information:
Chemical Formula:
(K,Na)2(Fe++,Mg)5Si12O30
Composition:
(Molecular Weight = 1,126.96 gm)
Potassium 5.20 % K
Sodium 1.02 % Na
Magnesium 2.70 % Mg
Iron 18.58 % Fe
Silicon 29.91 % Si
Oxygen 42.59 % O
Empirical Formula:
K1.5Na0.5Fe2+3.75Mg1.25Si12O30
IMA Status:
Approved IMA 1965
Physical Properties:
Color:
greenish blue.
Density:
2.87
Diaphaniety:
Transparent
Hardness:
5-6 - Between Apatite and Orthoclase
Luster:
Vitreous (Glassy)
Streak:
white
More details...