Mineralogy Database

Illite Mineral Data

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General Illite Information

Help on Chemical Formula: Chemical Formula: (K,H3O)(Al,Mg,Fe)2(Si,Al)4O10[(OH)2,(H2O)]
Help on Composition: Composition: Molecular Weight = 389.34 gm
   Potassium   6.03 %  K     7.26 % K2O
   Magnesium   1.87 %  Mg    3.11 % MgO
   Aluminum    9.01 %  Al   17.02 % Al2O3
   Iron        1.43 %  Fe    1.85 % FeO
   Silicon    25.25 %  Si   54.01 % SiO2
   Hydrogen    1.35 %  H    12.03 % H2O
   Oxygen     55.06 %  O
             ______        ______ 
             100.00 %       95.27 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K0.6(H3O)0.4Al1.3Mg0.3Fe2+0.1Si3.5O10(OH)2�(H2O)
Help on Environment: Environment: Weathering or hydrothermal alteration of muscovite-phengite. Also authigenic alteration of K-spar or recrystallization of smectites in marine sediments. Group name for dioctahedral interlayer-deficient clays.
Help on IMA Status: IMA Status: Not Approved IMA 1998
Help on Locality: Locality: Maquoketa shale, Gilead, Calhoun County, Illinois, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named in 1937 for the state of Illinois where the mineral was first described.
Help on Name Pronunciation: Name Pronunciation: Illite Say ILLITE
Help on Synonym: Synonym: Gumbelite
  Hydromica
  Hydromuscovite