Mineralogy Database

Niobophyllite Mineral Data

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General Niobophyllite Information

Help on Chemical Formula: Chemical Formula: K2Na(Fe++,Mn)7(Nb,Ti)2Si8O26(OH)4(F,O)
Help on Composition: Composition: Molecular Weight = 1,394.28 gm
   Potassium   5.61 %  K     6.76 % K2O
   Sodium      1.65 %  Na    2.22 % Na2O
   Titanium    0.69 %  Ti    1.15 % TiO2
   Manganese   6.90 %  Mn    8.90 % MnO
   Niobium    11.99 %  Nb   17.16 % Nb2O5
   Iron       21.03 %  Fe   27.05 % FeO
   Silicon    16.11 %  Si   34.47 % SiO2
   Hydrogen    0.29 %  H     2.58 % H2O
   Oxygen     34.71 %  O
   Fluorine    1.02 %  F     1.02 % F
                -   %   F    -0.43 % -O=F2    
             ______        ______ 
             100.00 %      100.89 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K2NaFe2+5.25Mn2+1.75Nb1.8Ti0.2Si8O26.25(OH)4F0.75
Help on Environment: Environment: Flakes in an albite-arfvedsonite paragneiss.
Help on IMA Status: IMA Status: Approved IMA 1964
Help on Locality: Locality: Ten Mile Lake, Seal Lake area, Labrador, NF, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the niobium content and foliated character common to the astrophyllite group.
Help on Name Pronunciation: Name Pronunciation: Niobophyllite + Pronunciation Say NIOBOPHYLLITE