Mineralogy Database

Combeite Mineral Data

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General Combeite Information

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