General Information:
Chemical Formula:
(Na,K)2(Mg,Fe++)5Si12O30
Composition:
(Molecular Weight = 1,031.99 gm)
Potassium 1.89 % K
Sodium 3.34 % Na
Magnesium 8.83 % Mg
Iron 6.76 % Fe
Silicon 32.66 % Si
Oxygen 46.51 % O
Empirical Formula:
Na1.5K0.5Mg3.75Fe2+1.25Si12O30
IMA Status:
Approved IMA 1966
Physical Properties:
Cleavage:
None
Color:
blue green, colorless, yellow, or reddish brown.
Density:
2.6
Diaphaniety:
Transparent
Hardness:
5-6 - Between Apatite and Orthoclase
Luster:
Vitreous (Glassy)
Streak:
white
More details...