C-type asteroid

Also known as C-class asteroid, C class, C type

asteroid spectral type; most common variety, forming around 75% of known asteroids

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253 Mathilde, a C-type asteroid

C-type (carbonaceous /ˌkɑːrbəˈneɪʃəs/) asteroids are the most common variety, forming around 75% of known asteroids. They are volatile-rich and distinguished by a very low albedo because their composition includes a large amount of carbon, in addition to rocks and minerals. They have an average density of about 1.7 g/cm.