firestone

English Thesaurus

1. a sandstone that withstands intense heat; used to line fireplaces and furnaces and kilns (noun.object)

hypernym	:	sandstone,
definition	:	a sedimentary rock consisting of sand consolidated with some cement (clay or quartz etc.) (noun.substance)

2. a piece of flint that is struck to light a fire (noun.substance)

hypernym	:	flint,
definition	:	a hard kind of stone; a form of silica more opaque than chalcedony (noun.substance)