firestone

Noun
  1. A piece of flint that is struck to light a fire (synset 114894972)
    is a type of: flint - a hard kind of stone; a form of silica more opaque than chalcedony
  2. A sandstone that withstands intense heat;
    Used to line fireplaces and furnaces and kilns (synset 109303142)
    is a type of: sandstone - a sedimentary rock consisting of sand consolidated with some cement (clay or quartz etc.)

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