Mineralogy Database

Polyakovite-(Ce) Mineral Data

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General Polyakovite-(Ce) Information

Help on Chemical  Formula: Chemical Formula: (Ce,La,Nd,Pr,Ca)4(Mg,Fe++)(Cr,Fe+++)2(Ti,Nb)2Si4O22
Help on Composition: Composition: Molecular Weight = 1,255.42 gm
   Calcium         0.64 %  Ca    0.89 % CaO
   Lanthanum      13.28 %  La   15.57 % La2O3
   Cerium         21.21 %  Ce   24.84 % Ce2O3
   Praeseodymium   2.24 %  Pr    2.63 % Pr2O3
   Thorium         1.85 %  Th    2.10 % ThO2
   Magnesium       1.55 %  Mg    2.57 % MgO
   Titanium        5.72 %  Ti    9.54 % TiO2
   Niobium         2.96 %  Nb    4.23 % Nb2O5
   Chromium        4.97 %  Cr    7.26 % Cr2O3
   Iron            4.00 %   Fe    1.14 % FeO /  4.45 % Fe2O3
   Silicon         8.95 %  Si   19.14 % SiO2
   Neodymium       4.60 %  Nd    5.36 % Nd2O3
   Oxygen         28.04 %  O
                 ______        ______ 
                 100.00 %       99.75 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ce1.9La1.2Nd0.4Pr0.2Ca0.2Th0.1Mg0.8Fe2+0.2Cr1.2Fe3+0.7Ti1.5Nb0.4Si4O22
Help on Environment: Environment: In a carbonatite vein and in phlogopite-fluororichterite rocks. Cr analogue of chevkinite-(Ce), structure
Help on IMA Status: IMA Status: Approved IMA 1998 (Dana # Added)
Help on Locality: Locality: N97 mine, Ilmen Natural Reserve, southern Urals, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Vladislav O. Polyakoy (1950-1993), Russian mineralogist.
Help on Synonym: Synonym: IMA1998-029