Mineralogy Database

Stilpnomelane Mineral Data

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General Stilpnomelane Information

Help on Chemical  Formula: Chemical Formula: K(Fe++,Mg,Fe+++)8(Si,Al)12(O,OH)27•n(H2O)
Help on Composition: Composition: Molecular Weight = 1,247.57 gm
   Potassium   3.13 %  K
   Magnesium   2.73 %  Mg
   Aluminum    4.33 %  Al
   Iron       29.54 %  Fe
   Silicon    22.51 %  Si
   Hydrogen    0.57 %  H
   Oxygen     37.19 %  O
             100.00 % 
Help on Empirical Formula: Empirical Formula: KFe2+4.3Mg1.4Fe3+2.3Si10Al2O24(OH)3�2(H2O)
Help on Environment: Environment: Commonly associated with iron ores.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1827
Help on Locality: Locality: Moravia of Czechoslovakia at Sternberg in a bed of limonite. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek for "shining" and "black", in allusion to its luster and color.
Help on Name Pronunciation: Name Pronunciation: Stilpnomelane + Pronunciation Say STILPNOMELANE
Help on Synonym: Synonym: Ferristilpnomelane - high Fe+++
  Ferrostilpnomelane - Low Fe+++