Mineralogy Database

Lalondeite Mineral Data

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General Lalondeite Information

Help on Chemical  Formula: Chemical Formula: (Na,Ca)6(Ca,Na)3Si16O38(F,OH)2•3(H2O)
Help on Composition: Composition: Molecular Weight = 1,441.00 gm
   Potassium   0.60 %  K     0.72 % K2O
   Sodium      8.50 %  Na   11.46 % Na2O
   Calcium    10.87 %  Ca   15.22 % CaO
   Silicon    31.50 %  Si   67.38 % SiO2
   Hydrogen    0.49 %  H     4.34 % H2O
   Chlorine    0.17 %  Cl    0.17 % Cl
                -   %   Cl   -0.04 % -O=Cl2   
   Oxygen     46.57 %  O
   Fluorine    1.31 %  F     1.31 % F
                -   %   F    -0.55 % -O=F2    
             ______        ______ 
             100.00 %      100.01 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na5.33Ca0.91K0.22Ca3Si16.16O38F0.99(OH)0.94Cl0.07�3(H2O)
Help on Environment: Environment: Discovered on a single, handsized sample of altered breccia (or possibly, altered marble) collected in the summer of 1985. Reyerite group; structure determined.
Help on IMA Status: IMA Status: Approved IMA 2002 (Dana # Added)
Help on Locality: Locality: Poudrette quarry, Mont Saint-Hilaire, Rouville County, Quebec, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Andre Edmond Lalonde (b. 1955), Professor of Geology at the University of Ottawa, Ottawa, Ontario, Canada.
Help on Synonym: Synonym: IMA2002-026