This is from a volcano called Ol Doinyo Lengai. The lava is called Carbonatite the lava is black during day light & dull orange at nights. It is a very runny lava with far more dissolved gasses. Its usually around 500c vs standard basalt thats around 2000c (Hawaiian type lava)
Video showing the runny black lava
https://www.youtube.com/watch?v=qputaVyn7TEVideo lecture about the volcano & surrounding area
https://www.youtube.com/watch?v=3jpbArY2L78