Combeite
A variety of Minerals
What is Combeite?
Combeite is a rare silicate mineral with the formula Na2Ca2Si3O9. It has a trigonal crystal system.
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Key Characteristics
Formation of Combeite
It was first described in 1957 for an occurrence in nephelinite lavas and tephra on Mt. Nyiragongo, Goma, Kivu, Democratic Republic of Congo (then Zaïre). It has also been reported from the Bellerberg volcano in Ettringen, Germany and the Oldoinyo Lengai volcano, Tanzania. It was named for Arthur Delmar Combe of the Geological Survey of Uganda. It is associated with götzenite at Mt. Shaheru, Congo; and with wollastonite, clinopyroxene, nepheline, melilite, titanian garnet and titanian magnetite at Oldoinyo Lengai.
Quick Facts
Physical Properties
- Density
- 2.79 g/cm³
Chemical Properties
- Chemical Formula
- Na4.5Ca3.5Si6O17.5(OH)0.5 Previously given as Na2Ca2(Si6O18)0.5.
- Elements
- Ca, H, Na, O, Si
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