Mineralogy Database

Masutomilite Mineral Data

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General Masutomilite Information

Help on Chemical  Formula: Chemical Formula: K(Li,Al,Mn++)3[(Si,Al)4O10](F,OH)2
Help on Composition: Composition: Molecular Weight = 402.17 gm
   Potassium   9.72 %  K    11.71 % K2O
   Lithium     3.45 %  Li    7.43 % Li2O
   Manganese   6.83 %  Mn    8.82 % MnO
   Aluminum   10.06 %  Al   19.01 % Al2O3
   Silicon    20.95 %  Si   44.82 % SiO2
   Hydrogen    0.13 %  H     1.12 % H2O
   Oxygen     41.77 %  O
   Fluorine    7.09 %  F     7.09 % F
                -   %   F    -2.98 % -O=F2    
             ______        ______ 
             100.00 %       97.02 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: KLi2Al0.5Mn2+0.5Si3AlO10F1.5(OH)0.5
Help on Environment: Environment: Li pegmatites.
Help on IMA Status: IMA Status: Approved IMA 1975
Help on Locality: Locality: Tanakamiyama district, Shiga Prefecture, Honshu, Japan. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Kazunosuke Masutomi, Japanese pharmacist and prominent amateur mineralogist and mineral collector.
Help on Name Pronunciation: Name Pronunciation: Masutomilite + Pronunciation Say MASUTOMILITE