General Information:
Chemical Formula:
(K,Na)Ca2Si3O8(F,OH)
Composition:
(Molecular Weight = 345.98 gm)
Potassium 8.48 % K
Sodium 1.66 % Na
Calcium 23.17 % Ca
Silicon 24.35 % Si
Hydrogen 0.07 % H
Oxygen 38.15 % O
Fluorine 4.12 % F
Empirical Formula:
K0.75Na0.25Ca2Si3O8F0.75(OH)0.25
IMA Status:
Approved IMA 1982
Physical Properties:
Cleavage:
[???] Indistinct
Color:
greenish gray or gray.
Density:
2.76
Hardness:
4-5 - Fluorite-Apatite
Luster:
Pearly
Streak:
gray white
More details...