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Montesommaite Mineral Data
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General Montesommaite Information
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 Chemical Formula: |
(K,Na)9Al9Si23O64•10(H2O) |
| Composition: |
Molecular Weight = 2,433.32 gm |
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Potassium 13.82 % K 16.65 % K2O |
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Sodium 0.19 % Na 0.25 % Na2O |
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Aluminum 10.42 % Al 19.69 % Al2O3 |
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Silicon 26.09 % Si 55.80 % SiO2 |
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Hydrogen 0.83 % H 7.40 % H2O |
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Oxygen 48.66 % O |
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______ ______ |
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100.00 % 99.80 % = TOTAL OXIDE |
| Empirical Formula: |
K8.6Na0.2Al9.4Si22.6O64•10(H2O) |
| Environment: |
In volcanic ejecta. |
| IMA Status: |
Approved IMA 1990 |
| Locality: |
Monte Somma, Pollena, Camania, Italy. Link to MinDat.org Location Data. |
| Name Origin: |
Named for the locality. |
| Name Pronunciation: |
Montesommaite + Pronunciation  |
| Synonym: |
ICSD 40111(subcell) |
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IMA1988-038 |
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PDF 46-1351 |
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