#clay  soil that is plastic when moist but hard when fired
  supertype:  #dirt__soil  the part of the earth's surface consisting of humus and disintegrated rock
  substance:  #silicon
  substance of:  #brick  #clayware  #roofing_tile
  subtype:  #adobe  the clay from which adobe bricks are made
  subtype:  #china_clay__chinaclay__china_stone__chinastone__kaolin__kaoline__porcelain_clay__porcelainclay__terra_alba__terraalba  a fine usually white clay formed by the weathering of aluminous minerals (as feldspar); used in ceramics and as an absorbent and as a filler (e.g., in paper)
  subtype:  #red_clay__redclay  clay whose redness results from iron oxide
  subtype:  #pipeclay__terra_alba__terraalba  fine white clay used in making tobacco pipes and pottery and in whitening leather
  subtype:  #bentonite  an absorbent aluminum silicate clay formed from volcanic ash
  subtype:  #fireclay  a heat-resistant clay
  subtype:  #Kitty_Litter  (trademark) granulated clay; placed in a container where it absorbs the waste products of a cat or dog
  subtype:  #potter's_clay__potter's_earth  clay that does not contain any iron; used in making pottery or for modeling
     subtype:  #slip.potter's_clay  potter's clay that is thinned and used for coating or decorating ceramics
  subtype:  #daub.clay  material used to daub walls

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