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The Element Iridium - Basic Physical and Historical Information ...

Discovered : by Smithson Tennant in 1803 Isolated in London, UK Origin : The name is derived from the Latin iris, meaning rainbow. Description : A hard silvery metal and one of the rarest on Earth. It is almost as inert to attack as gold and is used in special alloys and for the contacts in spark plugs. Image : Dragonfly iridescence. ...