#vegetable_matter__vegetablematter  matter produced by plants or growing in the manner of a plant
  supertype:  #substance__matter  that which has mass and occupies space; "an atom is the smallest indivisible unit of matter"
  subtype:  #peat  partially carbonized vegetable matter saturated with water; used as a fuel when dried
  subtype:  #coal  fossil fuel consisting of carbonized vegetable matter deposited in the Carboniferous period
     subtype:  #anthracite_coal__anthracite__hard_coal  a hard natural coal that burns slowly and gives intense heat
     subtype:  #bituminous_coal__soft_coal  rich in tarry hydrocarbons; burns readily with a smoky yellow flame
        subtype:  #cannel_coal  a bituminous coal that burns with a luminous flame
        subtype:  #sea_coal__seacoal  pulverized bituminous coal; used as a foundry facing
     subtype:  #lignite__browncoal__wood_coal  intermediate between peat and bituminous coal
        subtype:  #jet  a hard black form of lignite that takes a brilliant polish and is used in jewellery or ornamentation
     subtype:  #steam_coal__steamcoal  coal suitable for use under steam boilers

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