Metals not made of iron Metals of the precious class (i e , gold, silver, copper, etc )
Concerning any metal other than iron or metal alloy whose principal constituent is not iron Example: Copper (Cu), nickel (Ni), aluminum (Al), zinc (Zn), lead (Pb), magnesium (Mg)
Pertains to non-iron metals and compounds, such as brass, silver, gold, lead, aluminum, etc