DICT.TW Dictionary Taiwan

 fire·stone /ˈfaɪrˌston/
 燧石,耐火石

 Fire·stone n.
 1. Iron pyrites, formerly used for striking fire; also, a flint.
 2. A stone which will bear the heat of a furnace without injury; -- especially applied to the sandstone at the top of the upper greensand in the south of England, used for lining kilns and furnaces.
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 firestone
      n 1: a piece of flint that is struck to light a fire
      2: a sandstone that withstands intense heat; used to line
         fireplaces and furnaces and kilns