#hearthstone  a stone that forms a hearth
  supertype:  #stone  building material consisting of a piece of rock hewn in a definite shape for a special purpose; "he wanted a special stone to mark the site"
  part of:  #fireplace__open_fireplace__hearth  an open recess in a wall at the base of a chimney where a fire can be built
     part of:  #chimney  a vertical flue that provides a path through which smoke from a fire is carried away through the wall or roof of a building

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