Deloneite-(Ce)

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
More details...