Mineralogy Database

Eyselite Mineral Data

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General Eyselite Information

Help on Chemical  Formula: Chemical Formula: Fe+++Ge++++3O7(OH)
Help on Composition: Composition: Molecular Weight = 401.40 gm
   Gallium     0.69 %  Ga    0.93 % Ga2O3
   Iron       12.94 %  Fe   18.50 % Fe2O3
   Germanium  53.91 %  Ge   77.66 % GeO2
   Hydrogen    0.29 %  H     2.63 % H2O
   Oxygen     32.17 %  O
             ______        ______ 
             100.00 %       99.72 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe3+0.93Ga0.04Ge2.98O6.9(OH)1.17
Help on Environment: Environment: Eyselite was identified in a vug on a single specimen of renierite - germanite ore with minor associated tennantite.
Help on IMA Status: IMA Status: Approved IMA 2004 (Dana # Added)
Help on Locality: Locality: Tsumeb mine, Tsumeb, Namibia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Walter Hans Eysel (1935-1999), Professor of Crystallography at the Ruprecht-Karls-Universit´┐Żt, Heidelberg, Germany, for his contributions to the study of germanates.
Help on Synonym: Synonym: IMA2003-052