Mineralogy Database

Nioboaeschynite-(Y) Mineral Data

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General Nioboaeschynite-(Y) Information

Help on Chemical Formula: Chemical Formula: [(Y,REE),Ca,Th,Fe](Nb,Ti,Ta)2(O,OH)6
Help on Composition: Composition: Molecular Weight = 368.70 gm
   Calcium           3.37 %  Ca    4.71 % CaO
   La,Ce,Pr,Nd,Sm,  13.28 %  RE   15.49 % REE2O3
   Yttrium           4.58 %  Y     5.82 % Y2O3
   Thorium          11.33 %  Th   12.89 % ThO2
   Uranium           0.58 %  U     0.66 % UO2
   Tantalum          3.44 %  Ta    4.19 % Ta2O5
   Titanium         11.95 %  Ti   19.93 % TiO2
   Manganese         0.09 %  Mn    0.12 % MnO
   Niobium          23.69 %  Nb   33.88 % Nb2O5
   Iron              1.67 %  Fe    2.38 % Fe2O3
   Oxygen           26.04 %  O
                   ______        ______ 
                   100.00 %      100.08 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Y0.19REE0.34Ca0.31Th0.18U0.009Mn2+0.006Nb0.94Ti0.92Ta0.07Fe3+0.11O6
Help on Environment: Environment: Found in a series of calcite vein-dikes. Aeschynite group
Help on IMA Status: IMA Status: Approved IMA 2006 (Dana # Added)
Help on Locality: Locality: Bear Lake Diggings, Bancroft area, Ontario, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the dominant B-site cation, niobium and for the aeschynite group.
Help on Synonym: Synonym: IMA2003-038a
  Niobo-aeschynite-(Y) - Renamed Nioboaeschynite-(Y) by Mineralogical Record, v39 (2008), p131