What is the world's only active volcano that erupts natrocarbonatite lava?

Meru
Merapi
Ol Doinyo Lengai
Vesuvius
Ol Doinyo Lengai is an active volcano located in Tanzania. It uniquely produces natrocarbonatite lava. Due to this unusual composition, the lava is erupted at relatively low temperatures (approx. 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.
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