Mineralogy Database

Oneillite Mineral Data

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General Oneillite Information

Help on Chemical  Formula: Chemical Formula: Na15Ca3Mn3Fe++3Zr3Nb(Si25O73)(O,OH,H2O)3(OH,Cl)2
Help on Composition: Composition: Molecular Weight = 3,128.56 gm
   Sodium     11.02 %  Na   14.86 % Na2O
   Calcium     3.84 %  Ca    5.38 % CaO
   Zirconium   8.75 %  Zr   11.82 % ZrO2
   Manganese   5.27 %  Mn    6.80 % MnO
   Niobium     2.97 %  Nb    4.25 % Nb2O5
   Iron        5.36 %  Fe    6.89 % FeO
   Silicon    22.44 %  Si   48.01 % SiO2
   Hydrogen    0.10 %  H     0.89 % H2O
   Chlorine    0.57 %  Cl    0.57 % Cl
                -   %   Cl   -0.13 % -O=Cl2   
   Oxygen     39.68 %  O
             ______        ______ 
             100.00 %       99.34 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na15Ca3Mn2+3Fe2+3Zr3NbSi25O74.8(OH)2.5(H2O)0.3Cl0.5
Help on Environment: Environment: Found in nepheline syenite at the contact between a vein of fine-grained albite and the host rock. A member of the Eudialyte group.
Help on IMA Status: IMA Status: Approved IMA 1998 (Dana # Added)
Help on Locality: Locality: Poudrette quarry, Mont Saint-Hilaire, Rouville County, Quebec, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after John Johnston O´┐ŻNeill (1886-1966), geologist with the Geological Survey of Canada, Ottawa, and later, Professor of geology, Dean of Science and Dean of Engineering at Mc Gill University, Montreal, Canada.
Help on Synonym: Synonym: IMA1998-064