Key information
Atomic number: 
40
Atomic weight: 
91.22
Density: 
6490 kg/m³
Boiling point: 
3853.16° K
Melting point: 
2125.16° K
Heat vapour: 
502.51 kJ/mol
Heat fusion: 
16.75 kJ/mol
Thermal conductivity: 
2.4 W/m/K

Zirconium is never found in nature as a free metal. The principal economic source of Zirconium is the mineral, zircon. Zirconium and hafnium are contained in zircon at a ratio of about 50 to 1 and are difficult to separate. Once it has been removed hafnium can be used to make for control rods in a nuclear reactor.

Electron Shell: 
Amazon Books
Image of The Last Sorcerers: The Path from Alchemy to the Periodic Table
Author: National Academy of Sciences, Richard Morris
Publisher: Henry (Joseph) Press (2003)
Binding: Hardcover, 294 pages