Mineralogy Database

Dissakisite-(La) Mineral Data

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General Dissakisite-(La) Information

Help on Chemical  Formula: Chemical Formula: (Ca,Fe++,Th, La)(La,REE,Ca)(Al,Cr,Ti)2(Mg,Fe,Al)Si3O12(OH,F) with La > Ce
Help on Composition: Composition: Molecular Weight = 551.33 gm
   Sodium          0.01 %  Na    0.01 % Na2O
   Strontium       0.16 %  Sr    0.19 % SrO
   Calcium         8.69 %  Ca   12.15 % CaO
   Lanthanum       7.94 %  La    9.31 % La2O3
   Cerium          6.66 %  Ce    7.80 % Ce2O3
   Praeseodymium   0.49 %  Pr    0.57 % Pr2O3
   Samarium        0.05 %  Sm    0.06 % Sm2O3
   Gadolinium      0.03 %  Gd    0.03 % Gd2O3
   Erbium          0.03 %  Er    0.03 % Er2O3
   Thorium         3.79 %  Th    4.31 % ThO2
   Magnesium       2.74 %  Mg    4.55 % MgO
   Scandium        0.02 %  Sc    0.03 % Sc2O3
   Uranium         0.13 %  U     0.15 % UO2
   Titanium        0.26 %  Ti    0.43 % TiO2
   Manganese       0.09 %  Mn    0.12 % MnO
   Aluminum        9.00 %  Al   17.00 % Al2O3
   Vanadium        0.07 %  V     0.12 % VO2
   Zinc            0.18 %  Zn    0.22 % ZnO
   Chromium        1.40 %  Cr    1.83 % CrO
   Gallium         0.01 %  Ga    0.02 % Ga2O3
   Iron            4.08 %   Fe    3.13 % FeO /  2.17 % Fe2O3
   Silicon        15.13 %  Si   32.37 % SiO2
   Nickel          0.11 %  Ni    0.14 % NiO
   Phosphorus      0.04 %  P     0.10 % P2O5
   Hydrogen        0.18 %  H     1.63 % H2O
   Neodymium       0.99 %  Nd    1.16 % Nd2O3
   Oxygen         37.70 %  O
   Fluorine        0.03 %  F     0.03 % F
                    -   %   F    -0.01 % -O=F2    
                 ______        ______ 
                 100.00 %       99.73 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca1.19Mn2+0.009Sr0.01Na0.002Th0.09U0.003La0.31Ce0.26Pr0.01Nd0.03Sm0.002Gd0.001Er0.001Al1.81 Mg0.62Fe2+0.24Fe3+0.15Cr0.14(OH)
Help on Environment: Environment: Occurs in peridotite incorporated in a Variscan subducted crustal slab which crystallised under eclogite-facies conditions or during the early stage of retrogression in the amphibol ite facies. Mg-analogue of allanite-(L
Help on IMA Status: IMA Status: Approved IMA 2003 (Dana # Added)
Help on Locality: Locality: Found in a peridotite body from the Ulten zone (Austroalpine domain, Eastern Alps. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for its A2 site cation content and relationship to Dissakisite-(Ce).
Help on Synonym: Synonym: IMA2003-007