General Information:
Chemical Formula:
Na2CaAl4Si6O20·7(H2O)
Composition:
(Molecular Weight = 808.59 gm)
Sodium 5.69 % Na
Calcium 4.96 % Ca
Aluminum 13.35 % Al
Silicon 20.84 % Si
Hydrogen 1.75 % H
Oxygen 53.42 % O
Empirical Formula:
Na2CaAl4Si6O20·7(H2O)
Environment:
Secondary mineral in basalts.
IMA Status:
Approved IMA
Locality:
Gignat, Puy-de-Dome, France.
Physical Properties:
Cleavage:
[???] Perfect
Color:
white.
Density:
2.3
Diaphaniety:
Transparent to translucent
Habits:
Fibrous - Crystals made up of fibers., Spherical - Spherical, rounded aggregates.,
Hardness:
4-5 - Fluorite-Apatite
Luster:
Vitreous (Glassy)
Streak:
white
More details...