in the Dark" from Star Trek: The Original Series, in which a living rock creature's biochemistry is based on silicon, and in the 1994 The X-Files episode "Firewalker", in which a silicon-based organism is discovered in a volcano. In the 1984 film adaptation of Arthur C. Clarke's 1982 novel 2010: Odyssey Two, a character argues, "Whether we are based on carbon or on silicon makes no fundamental difference; we should each be treated with appropriate respect." See also Hypothetical types of biochemistry CHONPS, a mnemonic acronym for the order of the most common elements in living organisms: carbon, hydrogen, oxygen, nitrogen, phosphorus, and sulfur References External links Astrobiology Biology and pharmacology of chemical elements Carbon Life