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Combeite, Nepheline, Aegirine, Sodalite


Combeite : Na2Ca2Si3O9, Nepheline : (Na,K)[AlSiO4], Aegirine : NaFe3+[Si2O6], Sodalite : Na8[Cl2|Al6Si6O24]

Photo Copyright © Tony Peterson  - Creative Commons Non-Commercial No Derivatives Licence - Some Rights Reserved
Locality: Mt. Oldoinyo Lengai (Ol Doinyo Lengai), Arusha Region, Tanzania
Combeite (large colorless with inclusions), aegirine (green, acicular), nepheline (colorless, rectangular), and sodalite (colorless modified cubes, below largest combeite). Sample collected by Hans Eugster; sample in possession of T. Peterson. Plane polarized light: see accompanying photo with crossed polars.

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