lava
ultramafic lava
2013-05-05T16:56:29Z
ENVO
ENVO:01000235
PLB
Ultramafic lava is lava which, relative to other lava types, has very high magnesium oxide content and less than 45 percent silica by weight is thought to have erupted at temperatures of 1600 degrees Celsius. Due to its high temperature and composition, the viscosity of ultramafic lava is very low.