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Alluaivite

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Alluaivite
Alluaivite is an exceedingly rare mineral of the eudialyte group, with complex formula written as Na19(Ca,Mn)6(Ti,Nb)3Si26O74Cl·2H2O. It is unique among the eudialyte group as the only titanosilicate (other representatives of the group are usually zirconosilicates). It is named after Mt. Alluaiv in Lovozero Tundry massifKola PeninsulaRussia, where it is found in ultra-agpaitic, hyperalkaline pegmatites.

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Mineralogy Database Dictionary

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Alluaivite

General Information:
 Chemical Formula:
Na19(Ca,Mn++)6(Ti,Nb)3(Si3O9)2(Si10O28)2Cl·2(H2O)
 Composition:
(Molecular Weight = 2,169.25 gm)
Sodium 20.14 % Na
Calcium 8.31 % Ca
Titanium 4.97 % Ti
Manganese 3.80 % Mn
Niobium 3.21 % Nb
Silicon 20.72 % Si
Hydrogen 0.19 % 
Chlorine 3.27 % Cl
Oxygen 35.40 % 
 Empirical Formula:
Na19Ca4.5Mn2+1.5Ti2.25Nb0.75Si16O46Cl2·2(H2O)
 IMA Status:
Approved IMA 1989
Physical Properties:
 Cleavage:
None
 Color:
brownish pink or colorless.
 Density:
2.76
 Diaphaniety:
Transparent
 Hardness:
5-6 - Between Apatite and Orthoclase
 Luster:
Vitreous (Glassy)
 Streak:
white
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