Mineralogy Database

Allanite-(La) Mineral Data

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General Allanite-(La) Information

Help on Chemical Formula: Chemical Formula: Ca(REE,Ca)Al2(Fe++,Fe+++)(SiO4)(Si2O7)O(OH)
Help on Composition: Composition: Molecular Weight = 557.74 gm
   Calcium         9.19 %  Ca   12.86 % CaO
   Lanthanum       7.17 %  La    8.41 % La2O3
   Cerium          5.18 %  Ce    6.06 % Ce2O3
   Praeseodymium   2.68 %  Pr    3.13 % Pr2O3
   Yttrium         0.02 %  Y     0.02 % Y2O3
   Thorium         0.25 %  Th    0.28 % ThO2
   Magnesium       0.19 %  Mg    0.32 % MgO
   Titanium        0.06 %  Ti    0.10 % TiO2
   Aluminum        9.29 %  Al   17.56 % Al2O3
   Iron           10.50 %  Fe    8.50 % FeO /  5.30 % Fe2O3
   Silicon        15.00 %  Si   32.08 % SiO2
   Hydrogen        0.18 %  H     1.62 % H2O
   Neodymium       3.00 %  Nd    3.50 % Nd2O3
   Oxygen         37.29 %  O
                 ______        ______ 
                 100.00 %       99.74 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaLa0.28Ce0.2Nd0.11Pr0.1Y0.001Ca0.27Th0.006Al0.89Fe3+0.1AlFe2+0.66Fe3+0.27Mg0.04 Ti0.007Si0.97Al0.02O4(Si2O7)O(OH)
Help on Environment: Environment: Found in close association with calcite and barite in barite veins that cut a dolomitic metamorphosed limestone. Epidote group.
Help on IMA Status: IMA Status: Approved IMA 2003 (Dana # Added)
Help on Locality: Locality: Buca della Vena Mine, Stazzema, Apuan Alps, Lucca Province, Tuscany, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the Scottish mineralogist, T. Allan (1777-1833) and the La content.
Help on Name Pronunciation: Name Pronunciation: Allanite-(La) Say ALLANITE-(LA)
Help on Synonym: Synonym: IMA2003-065