General Information:
Chemical Formula:
K2Ca4[Si7O18(OH)](F,OH)
Composition:
(Molecular Weight = 758.60 gm)
Potassium 10.31 % K
Calcium 21.13 % Ca
Silicon 25.92 % Si
Hydrogen 0.17 % H
Oxygen 40.60 % O
Fluorine 1.88 % F
Empirical Formula:
K2Ca4Si7O18(OH)1.25F0.75
IMA Status:
Approved IMA
Physical Properties:
Cleavage:
[???] Perfect
Color:
brownish yellow, colorless, or light yellow.
Density:
2.76
Diaphaniety:
Transparent to Translucent
Hardness:
4-5 - Fluorite-Apatite
Luster:
Vitreous (Glassy)
More details...