General Information:
Chemical Formula:
Na4K2Ca2Si6Al6O24(SO4)Cl2
Composition:
(Molecular Weight = 1,131.67 gm)
Potassium 6.91 % K
Sodium 8.13 % Na
Calcium 7.08 % Ca
Aluminum 14.31 % Al
Silicon 14.89 % Si
Sulfur 2.83 % S
Chlorine 6.27 % Cl
Oxygen 39.59 % O
Empirical Formula:
Na4K2Ca2Si6Al6O24(SO4)Cl2
IMA Status:
Accepted IMA 1973
Locality:
Mte. Somma, Vesuvius, Italy.
Physical Properties:
Cleavage:
[1010] Perfect, [0001] Indistinct
Color:
colorless or white.
Density:
2.42 - 2.53, Average = 2.47
Diaphaniety:
Transparent
Hardness:
6 - Orthoclase
Luster:
Vitreous (Glassy)
Streak:
white
More details...