Mineralogy Database

Coombsite Mineral Data

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General Coombsite Information

Help on Chemical Formula: Chemical Formula: K(Mn++,Fe++,Mg)13(Si,Al)18O42(OH)14
Help on Composition: Composition: Molecular Weight = 2,127.66 gm
   Potassium   1.84 %  K     2.21 % K2O
   Magnesium   1.49 %  Mg    2.46 % MgO
   Manganese  20.14 %  Mn   26.01 % MnO
   Aluminum    5.71 %  Al   10.78 % Al2O3
   Iron       10.24 %  Fe   13.17 % FeO
   Silicon    17.82 %  Si   38.12 % SiO2
   Hydrogen    0.66 %  H     5.93 % H2O
   Oxygen     42.11 %  O
             ______        ______ 
             100.00 %       98.68 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: KMn2+7.8Fe2+3.9Mg1.3Si13.5Al4.5O42(OH)14
Help on IMA Status: IMA Status: Approved IMA 1996 (Dana # Added)
Help on Locality: Locality: Watson's Beach, Otago, South Island, New Zealand Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for D.S Coombs of the University of Otago, New Zealand.
Help on Synonym: Synonym: IMA1989-058