The meteorites belong to a class called ureilites, which have compositions different from those in any of the known stony planets in the solar system. (sciencenews.org)
The Almahata Sitta meteorites, a few hundred rock fragments that rained down on Sudan's Nubian Desert in 2008, included a number of coarse - grained, carbon - rich fragments known as ureilites. (sciencemag.org)
The Almahata Sitta meteorites are mostly ureilites, a rare type of stony meteorite that often contains clusters of nano - sized diamonds. (sciencedaily.com)