Yes indeed. Apparently some of the carbon will come along with hydrogen as methane when you bake it out of the rock. Separating straight to carbon and hydrogen

Yes indeed. Apparently some of the carbon will come along with hydrogen as methane when you bake it out of the rock. Separating straight to carbon and hydrogen is a hassle, though, as the carbon clogs the catalyst. Perhaps crashing a carbonaceous asteroid into the moon or disassembling in orbit and landing the results may work?