Basaltic

The most rare of the Asteroidal Class, these are fragments of old, disrupted bodies that at one time had enough mass for internal heat and volcanism to be generated. What remains is a small body with basaltic rock making up much of the composition. While it is extrememly rare for these to be the remains of a completely disrupted planet, they are often the remains of a world that was formed at the beginning of the solar system's formation, and later disrupted by planetesimal impact or extreme tidal disruption.