Ol Doño Lengai is the only active carbonatite volcano in the worldIn 1955, Ol Doigno Lengai began erupting, spitting ash and sodium carbonate dust into the air. It is an unusual volcano because its lava is rich in sodium and poor in quartz. From afar, Lengai appears to be covered in snow, like Mount Kenya and Mount Kilimanjaro, but a closer look reveals that the whitish substance is not snow at all, but sodium carbonate, a trace of recent eruptions. The volcano is located in Tanzania, in a part of the Rift Zone called the Saike Grid, where the Earth's crust is thought to be particularly thin.
