Iridium

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Iridium
Properties
Atomic symbol Ir
Atomic number 77
Classification Transition Metals
Atomic mass 192.22 amu
Other Information
Date of discovery 1803
Name of discoverer Smithson Tennant
Name origin From the Latin iridis, meaning rainbow.
Uses Used in conjunction with osmium to tip gold pen points, to make crucibles and other high-temperature containers. Also used to make alloys for standard weights and measures, as well as heat-resistant alloys. In addition, used in cancer irradiation, hypodermic needles, helicopter spark plugs and as hardening agent for platinum.
Obtained from Found in gravel deposits with platinum and osmiridium ores.
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