Mineralogy Database

Marianoite Mineral Data

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General Marianoite Information

Help on Chemical Formula: Chemical Formula: Na2Ca4(Nb,Zr)2(Si2O7)2(O,F)4
Help on Composition: Composition: Molecular Weight = 792.51 gm
   Sodium      5.60 %  Na    7.55 % Na2O
   Calcium    20.21 %  Ca   28.28 % CaO
   Hafnium     0.14 %  Hf    0.16 % HfO2
   Magnesium   0.09 %  Mg    0.14 % MgO
   Zirconium  10.35 %  Zr   13.98 % ZrO2
   Tantalum    0.07 %  Ta    0.08 % Ta2O5
   Titanium    0.57 %  Ti    0.95 % TiO2
   Manganese   0.29 %  Mn    0.38 % MnO
   Niobium    11.34 %  Nb   16.22 % Nb2O5
   Iron        0.56 %  Fe    0.73 % FeO
   Silicon    14.05 %  Si   30.06 % SiO2
   Oxygen     34.17 %  O
   Fluorine    2.57 %  F     2.57 % F
                -   %   F    -1.08 % -O=F2    
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na1.93Ca3.99Mn2+0.04Nb0.96Zr0.89Ti0.09Fe2+0.08Mg0.02Hf0.006Ta0.003Si3.96O14O2.92F1.07
Help on Environment: Environment: Discovered in rock which consists of phlogopite, U-rich pyrochlore, titanite, and marianoite (which makes up approximately 1 vol% of the rock). Cuspidine group
Help on IMA Status: IMA Status: Approved IMA 2005 (Dana # Added)
Help on Locality: Locality: Prairie Lake, Thunder bay district, Ontario, Canada Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Anthony ("Tony") Nicola Mariano (b. 1930) in recognition for his contributions to the study of alkaline rocks and carbonatites.
Help on Synonym: Synonym: IMA2005-005a