Mineralogy Database

Columbite-(Mg) Mineral Data

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General Columbite-(Mg) Information

Help on Chemical Formula: Chemical Formula: (Mg,Fe++,Mn)(Nb,Ta)2O6
Help on Composition: Composition: Molecular Weight = 330.49 gm
   Magnesium   5.15 %  Mg    8.54 % MgO
   Tantalum   10.95 %  Ta   13.37 % Ta2O5
   Titanium    2.90 %  Ti    4.83 % TiO2
   Manganese   1.66 %  Mn    2.15 % MnO
   Niobium    47.79 %  Nb   68.36 % Nb2O5
   Aluminum    0.82 %  Al    1.54 % Al2O3
   Iron        1.69 %  Fe    2.17 % FeO
   Oxygen     29.05 %  O
             ______        ______ 
             100.00 %      100.97 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg0.7Fe2+0.1Mn2+0.1Al0.1Nb1.7Ti0.2Ta0.2O6
Help on Environment: Environment: In a pegmatite in partially assimilated dolomitic marbles.
Help on IMA Status: IMA Status: Approved IMA 1963
Help on Locality: Locality: Kukhi-Lal deposit, southwestern Pamir Mountains, Tadzhikistan. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the dominent MAGNESIum and its relationship to ferrocolumbite (formerly columbite).
Help on Name Pronunciation: Name Pronunciation: Columbite-(Mg) + Pronunciation Say COLUMBITE-(MG)
Help on Synonym: Synonym: IMA2002-D
  Magnesiocolumbite - Renamed to Columbite-(Mg) by Mineralogical Record, v39 (2008), p 131
  Magnocolumbite
  Toddite