Ol Doinyo Lengai

Ol Doinyo Lengai is a  volcano in the East African Rift in Tanzania. The name means Mountain of God in the Maasai language. 

Ol Doinyo Lengai is the only volcano in the world that erupts a rock known as carbonatite. This is a rock which has greater than 50% of carbonate minerals.Bell, Keith (editor) (1989) Carbonatites: Genesis and Evolution, London, Unwin Hyman.

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 Other websites 

Category:Geography of Tanzania
Category:Volcanoes of Africa
Category:Carbonate rocks