Mineralogy Database

Johnsenite-(Ce) Mineral Data

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General Johnsenite-(Ce) Information

Help on Chemical  Formula: Chemical Formula: Na12(Ce,REE,Sr)3Ca6Mn3Zr3W(Si25O73)(CO3)(OH,Cl)2
Help on Composition: Composition: Molecular Weight = 3,374.09 gm
   Potassium       0.22 %  K     0.27 % K2O
   Sodium          8.00 %  Na   10.78 % Na2O
   Strontium       1.40 %  Sr    1.66 % SrO
   Calcium         6.62 %  Ca    9.26 % CaO
   Lanthanum       1.36 %  La    1.59 % La2O3
   Cerium          2.66 %  Ce    3.11 % Ce2O3
   Praeseodymium   1.00 %  Pr    1.17 % Pr2O3
   Samarium        0.09 %  Sm    0.10 % Sm2O3
   Gadolinium      0.28 %  Gd    0.32 % Gd2O3
   Dysprosium      0.14 %  Dy    0.17 % Dy2O3
   Yttrium         0.58 %  Y     0.74 % Y2O3
   Hafnium         0.05 %  Hf    0.06 % HfO2
   Zirconium       7.33 %  Zr    9.90 % ZrO2
   Titanium        0.45 %  Ti    0.76 % TiO2
   Manganese       4.33 %  Mn    5.59 % MnO
   Niobium         0.58 %  Nb    0.83 % Nb2O5
   Iron            1.29 %  Fe    1.66 % FeO
   Silicon        20.78 %  Si   44.47 % SiO2
   Hydrogen        0.04 %  H     0.33 % H2O
   Tungsten        4.25 %  W     5.36 % WO3
   Carbon          0.36 %  C     1.30 % CO2
   Neodymium       0.77 %  Nd    0.90 % Nd2O3
   Chlorine        0.79 %  Cl    0.79 % Cl
                    -   %   Cl   -0.18 % -O=Cl2   
   Oxygen         36.63 %  O
                 ______        ______ 
                 100.00 %      100.94 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na11.74Ce0.64La0.33Dy0.03Sr0.54Ca0.51Y0.22K0.19Ca5.06Pr0.24Nd0.18Gd0.06Sm0.02Mn2+0.44 Mn2+2.22Fe2+0.78Zr2.71Ti0.32Hf0.01Cl0.75
Help on Environment: Environment: Occurs intergrown with zirsilite-(Ce) in a cavity near the margin of a marble xenolith in an igneous breccia along the contact between porphyritic nepheline syenite and sodalite sye nite. Eudialyte group
Help on IMA Status: IMA Status: Approved IMA 2004 (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 for Ole Johnsen (b. 1940), of the Geological Museum, University of Copenhagen, Denmark, and for his extensive research into the eudialyte group.
Help on Synonym: Synonym: IMA2004-026