Well a new discovery suggests planets like that might be out there-planets littered with carbon minerals, instead of the oxygen-rich silicates, like quartz, that cover the Earth.

Carbon dioxide forms an acid when it dissolves in water. This acid can react with minerals to form carbonates, locking away the carbon in a relatively inert state.

Like basalt, peridotite chemically reacts with carbon dioxide-saturated water to quickly form minerals, some of which contain carbon.