Firestone :: Firestone (n.) Iron pyrites, formerly used for striking fire; also, a flint..

Firestone :: Firestone (n.) 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..

Irestone :: Irestone (n.) Any very hard rock.

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