Manganonordite-(Ce)

General Information: Chemical Formula:Na3SrCeMn++Si6O17 Composition:(Molecular Weight = 792.15 gm)Sodium 8.71 % NaStrontium 11.06 % SrCerium 17.69 % CeManganese 6.94 % MnSilicon 21.27 % SiOxygen 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:whiteMore details...