Mineral Information and Data:

Alluaivite
Na19(Ca,Mn2+)6(Ti,Nb)3Si26O74Cl • 2H2O [CNMNC approved formula]

Named for its occurrence on Mt. Alluaiv, Kola Peninsula, Russia.

IMA status : Approved Species 1990 (IMA1988-052)
CLASSIFICATION 
Dana
(8th edition) :
64.01.01.02  
  (64) Cyclosilicates
  (64.01) Cyclosilicate Rings with Other Anions and Insular Silicate Groups with mixed ring types
  (64.01.01) Eudialyte Group
  
Nickel-Strunz
(10th edition) :
09.CO.10
  (09) Silicates
  (09.C) Cyclosilicates
  (09.CO) [Si9O27]18- 9-membered rings
  
Crystal system: Trigonal System
Point group (H-M): 3m (or 3 2/m) — hexagonal-scalenohedral
Unit cell: a = 14.046 Å, c = 60.60 Å
Crystal Habit: Irregular accumulations to 1 mm, intergrown with eudialyte
  
Color: Colorless, pink-brownish tint
Diaphaneity: Transparent.
Luster: Vitreous
Hardness (Mohs): 5 - 6
Measured Density: 2.76 g/cm3
Tenacity: Brittle
Streak: White
  
Geologic Setting: In ultra-agpaitic pegmatites in differentiated alkalic massif.
Mineral Association: Eudialyte, nepheline, sodalite, potassic feldspar, arfvedsonite, aegirine
  

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