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Combeite Gallery

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

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.
 © Tony PetersonPhoto ID: 46535    View Count: 545

Multiple photos availableCombeite : Na2Ca2Si3O9, Aegirine : NaFe3+[Si2O6], Nepheline : (Na,K)[AlSiO4]

Mt. Oldoinyo Lengai (Ol Doinyo Lengai), Arusha Region, Tanzania

Photomicrograph of combeite (large crystal), aegirine (green), and nepheline (colorless, rectangular) in strongly peralkaline nephelinite lava from Oldoinyo Lengai (plane polarized light). Sample collected by Hans Eugster; sample in possession of T. Peterson.
 © Tony PetersonPhoto ID: 46532    View Count: 337
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