Class named for the Renazzo meteorite that fell in Italy in 1824, are similar to CMs in that they contain hydrous silicates, traces of water, and magnetite. The main difference is that CRs contain Ni-Fe metal and Fe sulfide that occurs in the black matrix and in the large chondrules (>1 mm diameter; 50-60 vol. %). CRs are marked by Fe-poor olivine (Fe1-7) and pyroxenes (Fs2-5). A possible parent body is 2 Pallas. CH and CB chondrites are so closely related to the CRs that all three groups may have come from the same parent or at least from the same region of the solar nebula.