#iron_ore  an ore from which iron can be extracted
  supertype:  #ore  a metal-bearing mineral valuable enough to be mined
  substance:  #Fe
  subtype:  #goethite__gothite  a red or yellow or brown mineral; an oxide of iron that is a common constituent of rust
  subtype:  #chamosite  a greenish gray or black silicate of iron and aluminum
  subtype:  #taconite  a variety of chert containing magnetite and hematite; mined as a low-grade iron ore
  subtype:  #hematite__haematite  the principal form of iron ore; consists of ferric oxide in crystalline form; occurs in a red earthy form
  subtype:  #lepidocrocite  a red to reddish brown mineral consisting of iron oxide hydroxide (FeO(HO)); often found in iron ores together with goethite
  subtype:  #limonite  a widely occurring iron oxide ore; a mixture of goethite and hematite and lepidocrocite
  subtype:  #magnetite__magnetic_iron-ore  an oxide of iron that is strongly attracted by magnets
     subtype:  #lodestone__loadstone  magnetite that possess polarity and has the power to attract as well as to be attracted magnetically
  subtype:  #chalybite__siderite  iron ore in the form of ferrous carbonate

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