Mineralogy Database

Londonite Mineral Data

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General Londonite Information

Help on Chemical  Formula: Chemical Formula: CsAl4Be4(B,Be)12O28
Help on Composition: Composition: Molecular Weight = 808.60 gm
   Cesium      7.89 %  Cs    8.36 % Cs2O
   Potassium   1.84 %  K     2.21 % K2O
   Rubidium    0.95 %  Rb    1.04 % Rb2O
   Sodium      0.09 %  Na    0.11 % Na2O
   Lithium     0.02 %  Li    0.04 % Li2O
   Calcium     0.10 %  Ca    0.14 % CaO
   Manganese   0.07 %  Mn    0.09 % MnO
   Beryllium   5.57 %  Be   15.47 % BeO
   Aluminum   13.28 %  Al   25.09 % Al2O3
   Iron        0.07 %  Fe    0.09 % FeO
   Silicon     0.03 %  Si    0.07 % SiO2
   Boron      14.69 %  B    47.31 % B2O3
   Oxygen     55.40 %  O
             ______        ______ 
             100.00 %      100.03 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Cs0.48K0.38Rb0.09Na0.03Ca0.02Mn2+0.01Al3.98Li0.02Fe2+0.01Be4B10.99Si0.01BeO28
Help on Environment: Environment: Found in miarolitic cavities. Cs-analogue of rhodizite.
Help on IMA Status: IMA Status: Approved IMA 1999 (Dana # Added)
Help on Locality: Locality: Central units or the Antandrokomby, Antsonombato, and Ampanivana granitic pegmatites in Central Madagascar. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for David London (1953-), petrologist at the University of Oklahoma, Oklahoma, USA.
Help on Synonym: Synonym: IMA1999-014