#carbon__C__atomic_number_6  an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds
  supertype:  chemical_element__element  any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter
  substance of:  coal  limestone  petroleum
  subtype:  fullerene  a form of carbon having a large spheroidal molecule consisting of an empty cage of sixty or more carbon atoms
     subtype:  buckminsterfullerene__buckyball  the first known example of a fullerene
  subtype:  radiocarbon__carbon14  a radioactive isotope of carbon
  subtype:  wood_coal__charcoal  a carbonaceous material obtained by heating wood or other organic matter in the absence of air
  subtype:  carbon_black__lampblack__soot__smut  a black colloidal substance consisting wholly or principally of amorphous carbon and used to make pigments and ink
  subtype:  activated_carbon__activatedcarbon__activated_charcoal__activatedcharcoal  powdered or granular carbon used for purifying by adsorption; given orally (as a slurry) it is an antidote for some kinds of poisons
  subtype:  graphite__black_lead__blacklead__plumbago  used as a lubricant and as a moderator in nuclear reactors
     subtype:  pencil_lead__lead  mixture of graphite with clay in different degrees of hardness; the marking substance in a pencil
  subtype:  adamant__diamond  very hard native crystalline carbon valued as a gem
     subtype:  black_diamond__blackdiamond__carbonado  an inferior dark diamond used in industry for drilling and polishing

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