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Gregoryite, Nyerereite


Gregoryite : (Na2,K2,Ca)CO3, Nyerereite : Na2Ca(CO3)2

Photo Copyright © Tony Peterson  - This image is copyrighted. Unauthorized reproduction prohibited.
Locality: Mt. Oldoinyo Lengai (Ol Doinyo Lengai), Arusha Region, Tanzania
Photomicrograph of a thin section of natrocarbonatite lava, here dominated by rounded gregoryite with tabular nyerereite. See additional photo with crossed polars. Collection and photo, T. Peterson (lava collected by Charles Milton). The blue patches are stained epoxy.

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