General Information:
Chemical Formula:
KNa4CaMn++4Fe++10Al(PO4)12(OH,F)2
Composition:
(Molecular Weight = 2,151.01 gm)
Potassium 1.82 % K
Sodium 4.28 % Na
Calcium 1.86 % Ca
Manganese 10.22 % Mn
Aluminum 1.25 % Al
Iron 25.96 % Fe
Phosphorus 17.28 % P
Hydrogen 0.07 % H
Oxygen 36.82 % O
Fluorine 0.44 % F
Empirical Formula:
KNa4CaMn2+4Fe2+10Al(PO4)12(OH)1.5F0.5
Environment:
Granitic pegmatites and phosphate rich marine sediments.
Locality:
Nickel Plate mine in the Keystone district, South Dakota.
Physical Properties:
Cleavage:
[001] Distinct
Color:
olive green, clove brown, or yellow.
Density:
3.56
Diaphaniety:
Translucent
Hardness:
5 - Apatite
Luster:
Vitreous - Greasy
Streak:
green gray
More details...