General Information:
Chemical Formula:
Na4Al3Si9O24Cl
Composition:
(Molecular Weight = 845.11 gm)
Sodium 10.88 % Na
Aluminum 9.58 % Al
Silicon 29.91 % Si
Chlorine 4.20 % Cl
Oxygen 45.44 % O
Empirical Formula:
Na4Al3Si9O24Cl
Environment:
Basaltic tuff.
Locality:
Pianura. Near Naples, Italy.
Physical Properties:
Cleavage:
[100] Distinct, [110] Distinct
Color:
bluish, brownish, colorless, violet, or greenish.
Density:
2.5 - 2.62, Average = 2.56
Diaphaniety:
Transparent to Translucent
Hardness:
5.5-6 - Knife Blade-Orthoclase
Luminescence:
Fluorescent.
Luster:
Vitreous - Pearly
Streak:
white
More details...