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Combeite Mineral Data
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General Combeite Information
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 Chemical Formula: |
Na2Ca2Si3O9 |
| Composition: |
Molecular Weight = 354.39 gm |
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Sodium 12.97 % Na 17.49 % Na2O |
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Calcium 22.62 % Ca 31.65 % CaO |
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Silicon 23.78 % Si 50.86 % SiO2 |
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Oxygen 40.63 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Na2Ca2Si3O9 |
| Environment: |
In nephelinite (Mt. Shaheru, Congo); in nephelinite and ash ejecta (Oldoinyo Lengai volcano, Tanzania). |
| IMA Status: |
Valid Species (Pre-IMA) 1957 |
| Locality: |
On Mt. Shaheru, the extinct southern cone of Mt. Nyiragongo, Kivu Province, Congo (Zaire). Link to MinDat.org Location Data. |
| Name Origin: |
Named for Arthur Delmar Combe, Geological Survey of Uganda. |
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