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What is the Molecular Form for Carbon in C-Type Asteroids?

Question:
In what molecular form is carbon found on C-type asteroids? i.e. Is it bonded to other elements, or is it pure in some form such as graphite or pyrolytic carbon?
Answer:
C-type asteroids, as their name implies, are carbonaceous, consisting of clay, minerals, and silicate rocks and are believed to be relics from the formation of our Solar System.