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natrocarbonatite
Natrocarbonatite is a rare carbonatite lava which erupts from the Ol Doinyo Lengai volcano in Tanzania within the East African Rift of eastern Africa.
== Composition ==
Whereas most lavas are rich in silicate minerals, the natrocarbonatite lavas of Ol Doinyo Lengai are rich in the rare sodium and potassium carbonate minerals, nyerereite and gregoryite.
Due to this unusual composition, the lava is erupted at relatively low temperatures (approximately 500-600 °C). This temperature is so low that the molten lava appears black in sunlight, rather than having the red glow common to most lavas. It is also much more fluid than silicate lavas.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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