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 %
NaCalcium 1.86 %
CaManganese 10.22 %
MnAluminum 1.25 %
AlIron 25.96 %
FePhosphorus 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
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