Rumuruti chondrites (also known as R chondrites) are a very rare type of chondrites. Less than 0,5% of chondrites fall into this classification. They differ from ordinary chondrites mainly in having most of the metal in the form of sulfides, they are more oxidized and contain little metallic Iron and Nickel. Apparently, R chondrites come from an asteroid’s regolith (surface with loose solid materials). This piece is the main mass of NWA 13518.