Mineralogy Database

Lewisite Mineral Data

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General Lewisite Information

Help on Chemical  Formula: Chemical Formula: (Ca,Fe++,Na)2(Sb,Ti)2O7
Help on Composition: Composition: Molecular Weight = 426.94 gm
   Sodium      0.81 %  Na    1.09 % Na2O
   Calcium    12.20 %  Ca   17.08 % CaO
   Titanium    2.24 %  Ti    3.74 % TiO2
   Manganese   0.64 %  Mn    0.83 % MnO
   Iron        6.54 %  Fe    8.41 % FeO
   Antimony   51.33 %  Sb   68.19 % Sb2O5
   Oxygen     26.23 %  O
             ______        ______ 
             100.00 %       99.34 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca1.3Fe2+0.5Na0.15Mn2+0.05Sb1.8Ti0.2O7
Help on Environment: Environment: An alteration of large tetrahedrite crystals and in eluvial sands. Lewisite (1899) is now considered Ti-bearing romeite.
Help on IMA Status: IMA Status: Discredited IMA 2006 (Dana # Added)
Help on Locality: Locality: Tripuhy cinnabar mine, Ouro Preto, Minas Gerais, Barzil. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Willam James Lewis (1847-1926), Professor of Mineralogy, Cambridge University, Canbridge, England.
Help on Name Pronunciation: Name Pronunciation: Lewisite Say LEWISITE