General Information:
Chemical Formula:
Na3SrCeMn++Si6O17
Composition:
(Molecular Weight = 792.15 gm)
Sodium 8.71 % Na
Strontium 11.06 % Sr
Cerium 17.69 % Ce
Manganese 6.94 % Mn
Silicon 21.27 % Si
Oxygen 34.34 % O
Empirical Formula:
Na3SrCeMn2+Si6O17
Environment:
In the central (ussingite) zone of hyperagpaitic pegmatite in sodalite nepheline syenites and in ussingite veinlets. The manganese analogue of nordite-(Ce) and ferronordite-(Ce).
IMA Status:
Approved IMA (Dana # Added)
Locality:
Chinlusuia River, Lovozero Alkaline massif, Kola Peninsula, Russia.
Name Origin:
Named as the Mn++ dominant analogue of nordite-(Ce). Nordite series is named after the word for north because of its northern origin in the Lovozero Massif.
Physical Properties:
Cleavage:
[100] Perfect
Color:
pale brown, colorless, or brown.
Density:
3.43 - 3.56, Average = 3.49
Diaphaniety:
Transparent
Habits:
Tabular - Form dimensions are thin in one direction., Rosette - Bundled tabular aggregates resembling rose flower petals.,
Hardness:
5-5.5 - Apatite-Knife Blade
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
white
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