1. The chemical element of atomic number 13. Silver-gray metal. 2. Red-brown metal. 3. Strong and hard silver-gray metal. It is used for construction, especially in the form of steel. 4. Hard rock consisting of quartz and mica, used as a building stone. 5. Chemical element used in alloys, notably bronze. 6. Black rock used as fuel. 7. Reddish-brown stone, chalcedony. 8. An important component of special steels and magnetic alloys.(AN is 25). 9. Silver-white metal. It’s a part of various minerals. North American: a five-cent coin.