Abstract
The volcano Kerimasi lies on the Eastern Rift Zone of Africa and is built up of tuffs, agglomerates, and flows which range in composition from nephelinites to carbonatites. Many of the surface rocks are tuffs which contain lapilli with microphenocrysts of melilite and calcite. A coarse-grained apatite-søvite containing monticellite and periclase overgrowths on magnesioferrite outcrops within the crater. A flow near the crater rim contains calcite phenocrysts which are single crystals and show complex zoning with cathodoluminescence. These crystals are often aligned giving a trachyitic texture and are thought to represent primary magmatic crystallization of calcite.
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