firestone

Iron pyrite, formerly used for striking fire.
A flint.
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.

Stein mit scharfer Kante

pietra fuocaia

pietra affilata

فيرستون

piedra de filo agudo

From fire + stone.

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