Aspects of this topic are discussed in the following places at Britannica.
Asteroids of the B, C, F, and G classes have low albedos and spectral reflectances similar to those of carbonaceous chondritic meteorites and their constituent assemblages produced by hydrothermal alteration and/or metamorphism of carbonaceous precursor materials. Some C-class asteroids are known to have hydrated minerals on their surfaces, whereas Ceres, a G-class asteroid, probably has water...
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