Mineralogy Database

Tobelite Mineral Data

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General Tobelite Information

Help on Chemical  Formula: Chemical Formula: (NH4,K)Al2(Si3Al)O10(OH)2
Help on Composition: Composition: Molecular Weight = 376.27 gm
   Potassium   2.08 %  K     2.50 % K2O
   Aluminum   20.08 %  Al   37.94 % Al2O3
   Silicon    23.89 %  Si   51.10 % SiO2
   Hydrogen    0.54 %  H      -   % Calc as (NH4)2O
   Hydrogen    0.54 %  H     4.79 % H2O
   Nitrogen    1.86 %  N     3.46 % (NH4)2O
   Oxygen     51.03 %  O
             ______        ______ 
             100.00 %       99.79 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: (NH4)0.5K0.2Al2Si3.2Al0.8O10(OH)2
Help on Environment: Environment: Hydrothemal alteration of biotite andesite dike or in a hydrothermally altered rhyolite tuff.
Help on IMA Status: IMA Status: Approved IMA 1982
Help on Locality: Locality: Ohgidani pottery stone deposit, Tobe, Ehime Prefecture, adn in the Horo pryophyllite deposit, Toyosaka, hiroshima Prefecture, Japan. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Tobelite Say TOBELITE