firestone

  1. Iron pyrite, formerly used for striking fire.
  2. A flint.
  3. 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.

Etymology

From fire + stone.

Stein mit scharfer Kante

pietra fuocaia

pietra affilata

فيرستون

piedra de filo agudo

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