carbon (1789):
a nonmetallic chiefly tetravalent element found native (as in the diamond and graphite) or as a constituent of coal, petroleum, and asphalt, of limestone and other carbonates, and of organic compounds or obtained artificially in varying degrees of purity especially as carbon black, lampblack, activated carbon, charcoal, and coke

Groove

The spiral track cut into a phonograph record for the stylus to follow.

"Slang" A settled routine: got into the groove of a nine-to-five job.

"Slang" A situation or an activity that one enjoys or to which one is especially well suited: found his groove playing bass in a trio.

Slang. A very pleasurable experience.