Mineralogy Database

Montdorite Mineral Data

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General Montdorite Information

Help on Chemical Formula: Chemical Formula: (K,Na)(Fe++,Mn++,Mg)2.5[Si4O10](F,OH)2
Help on Composition: Composition: Molecular Weight = 467.53 gm
   Potassium   6.27 %  K     7.56 % K2O
   Sodium      1.23 %  Na    1.66 % Na2O
   Magnesium   2.60 %  Mg    4.31 % MgO
   Manganese   9.40 %  Mn   12.14 % MnO
   Iron       14.33 %  Fe   18.44 % FeO
   Silicon    24.03 %  Si   51.41 % SiO2
   Hydrogen    0.11 %  H     0.96 % H2O
   Oxygen     35.93 %  O
   Fluorine    6.10 %  F     6.10 % F
                -   %   F    -2.57 % -O=F2    
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K0.75Na0.25Fe2+1.2Mn2+0.8Mg0.5Si4O10F1.5(OH)0.5
Help on Environment: Environment: Small grains in perialkaline rhyolite.
Help on IMA Status: IMA Status: Approved IMA 1979
Help on Locality: Locality: Mt. Dore stratovolcano, near La Bourboule, France. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Montdorite + Pronunciation Say MONTDORITE