Below are possible answers for the crossword clue Broken stone used in road-making.
cover with metal
containing or made of or resembling or characteristic of a metal; "a metallic compound"; "metallic luster"; "the strange metallic note of the meadow lark, suggesting the clash of vibrant blades"- Ambrose Bierce
a mixture containing two or more metallic elements or metallic and nonmetallic elements usually fused together or dissolving into each other when molten; "brass is an alloy of zinc and copper"
any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
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