Mineralogy Database

Glauconite Mineral Data

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General Glauconite Information

Help on Chemical  Formula: Chemical Formula: (K,Na)(Fe+++,Al,Mg)2(Si,Al)4O10(OH)2
Help on Composition: Composition: Molecular Weight = 426.93 gm
   Potassium   5.49 %  K     6.62 % K2O
   Sodium      0.27 %  Na    0.36 % Na2O
   Magnesium   2.28 %  Mg    3.78 % MgO
   Aluminum    1.90 %  Al    3.58 % Al2O3
   Iron       19.62 %  Fe    3.37 % FeO / 24.31 % Fe2O3
   Silicon    25.00 %  Si   53.48 % SiO2
   Hydrogen    0.47 %  H     4.22 % H2O
   Oxygen     44.97 %  O
             ______        ______ 
             100.00 %       99.72 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K0.6Na0.05Fe3+1.3Mg0.4Fe2+0.2Al0.3Si3.8O10(OH)2
Help on Environment: Environment: Altered from detrital biotite by marine diagenesis in shallow water under reducing conditions; especially in sandstone.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1828
Help on Locality: Locality: Otago Peninsula, New Zealand. Common world wide. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek "glaucos" for the blue green color.
Help on Name Pronunciation: Name Pronunciation: Glauconite + Pronunciation Say GLAUCONITE