ELEMENT % by Weight ----------------------- Carbon 2.0 Metals 1.8 Nitrogen 0.2 Silicates 83.0 Water 11.0
At most, they can be 20% water and can contain as much as 4% carbon. The other elements will vary as well. In addition to water, Carbonaceous Chondrites contain around 5% kerogen. Kerogen contains:
ELEMENT % by Weight ----------------------- Carbon 77.5 Hydrogen 7.5 Nitrogen 1.5 Oxygen 12.0 Sulfur 1.5
Carbonaceous Chondrites make up 50% of the asteroids at the inner edge of the Belt, and 95% at the outer edge. Unfortunately, these are rather far from Earth.
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