General Information:
Chemical Formula:
NaCa2SrCe(PO4)3F
Composition:
(Molecular Weight = 634.79 gm)
Sodium 3.62 % Na
Strontium 13.80 % Sr
Calcium 12.63 % Ca
Cerium 22.07 % Ce
Phosphorus 14.64 % P
Oxygen 30.24 % O
Fluorine 2.99 % F
Empirical Formula:
NaCa2SrCe(PO4)3F
Environment:
Carbonitite igneous rocks.
IMA Status:
Approved IMA 1995
Locality:
Mount Koashva, Khibina alkaline massif, Kola Peninsula, Russia.
Name Origin:
For B. N. Delone (Delaunay) (1890-1980), Russian mathematical crystallographer.
Physical Properties:
Cleavage:
[100] Fair, [001] Fair
Color:
bright yellow.
Density:
3.92 - 3.95, Average = 3.93
Diaphaniety:
Transparent
Habits:
Granular - Generally occurs as anhedral to subhedral crystals in matrix., ,
Hardness:
5 - Apatite
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
white
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