Copper: Copper is a reddish-coloured metal, with a high electrical and thermal conductivity (among pure metals at room temperature, only Silver has a higher electrical conductivity). Copper may well be the oldest metal in use, as Copper artifacts dating to 8700 BC have been found. Besides being part of various Ores, Copper can be found in the metallic form (i.e. Native Copper) in some locations.
There are numerous alloys of Copper - speculum metal is a Copper/Tin alloy, Brass is a Copper/Zinc alloy, and Bronze is a Copper/Tin alloy. Monel metal is a Copper/Nickel alloy, also called Cupronickel.