Zirconium
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Zirconium is a chemical element, having the chemical symbol Zr.
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Its atomic number (the number of protons) is 40. It has a Standard Atomic Weight of 91.224(2), and is typically found as a solid in its elemental form.
Zirconium is considered to be a member of the "Transition metal" class of elements, has a boiling point of 4,409 °C , and a melting point of 1,855 °C .
Civilian applications include cladding of nuclear fuel elements for nuclear reactors cores. Cubic zirconia is a form of high-quality synthetic gemstone.
Zirconium cases are used on military munitions, especially cluster submunitions, where an incendiary effect is desired.