In the past, some visitors to the crater believed they were seeing mud flows. During the day it is not incandescent most flows look like very fluid black oil, or brown foam, depending on the gas content. Natrocarbonatite lava glows orange at night, but is not nearly as bright as silicon-based lavas since it is not as hot. Lava with a low gas content can flow like a whitewater stream, and actually has a viscosity near that of water. Natrocarbonatite is the most fluid lava in the world. Natrocarbonatite lava is also much cooler than other lavas, being only about 950 degrees F (510 degrees C) compared to temperatures over 2000 degrees F (~1100 degrees C) for basaltic lavas.
It is the only volcano in the world that sometimes erupts natrocarbonatite lava, a highly fluid lava that contains almost no silicon. Ol Doinyo Lengai volcano, altitude 2960 meters (9711 feet), is a unique and extremely fascinating volcano that towers above the East African Rift Valley in Northern Tanzania, just south of Lake Natron.
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