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