Antimony its elemental form is a silvery white , brittle , fusible , crystalline solid. Antimony is increasingly being used in the semiconductor industry in the production of diodes , infrared detectors, and Hall-effect devices.

Copper is a reddish-colored metal . It is a ductile metal with excellent electrical conductivity , and finds extensive use as an electrical conductor, thermal conductor, as a building material, and as a component of various alloys .

Magnesium is the eighth most abundant element and constitutes about 2% of the Earth 's crust by weight, and it is the third most plentiful element dissolved in seawater . Magnesium ion is essential to all living cells.

Iron ores are rocks and minerals from which metallic iron can be extracted.