Mineralogy Database

Varennesite Mineral Data

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General Varennesite Information

Help on Chemical  Formula: Chemical Formula: Na8Mn++2Si10O25(OH,Cl)2•12(H2O)
Help on Composition: Composition: Molecular Weight = 1,234.05 gm
   Sodium     14.90 %  Na   20.09 % Na2O
   Manganese   8.90 %  Mn   11.50 % MnO
   Silicon    22.76 %  Si   48.69 % SiO2
   Hydrogen    2.08 %  H    18.61 % H2O
   Chlorine    1.44 %  Cl    1.44 % Cl
                -   %   Cl   -0.32 % -O=Cl2   
   Oxygen     49.91 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na8Mn2+2Si10O25(OH)1.5Cl0.5•12(H2O)
Help on Environment: Environment: As a primary, late-stage mineral in a sill.
Help on IMA Status: IMA Status: Approved IMA 1995
Help on Locality: Locality: Demix-Varennes quarry, which lies between the villages of Varennes and Saint-Amable, in Vercheres County, Quebec Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For the locality.
Help on Name Pronunciation: Name Pronunciation: Varennesite + Pronunciation Say VARENNESITE
Help on Synonym: Synonym: ICSD 81583
  IMA1994-017
  PDF 49-1860