LYCOS RETRIEVER 
Iridium: Earth
built 637 days ago
Iridium is a precious, silver-white metal and one of the densest materials found on earth. The natural properties of Iridium offered NGK the opportunity to create one of the world's finest spark plugs. The result are spark plugs that require less voltage to spark, burns fuel more efficiently, sparks at leaner air/fuel mixtures, and delivers higher horsepower and better gas mileage.
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Iridium is the rarest non-radioactive, non-noble gas element in the Earth's crust, but it is relatively common in meteorites. Iridium and osmium are the densest elements, and both are believed to have dropped below the Earth's crust toward the core when the Earth was young and molten. The concentration of iridium in meteorites matches the concentration of iridium in the Earth as a whole.
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Iridium is extremely inert chemically, resisting even the action of aqua regia. In its chemical compounds it forms tetravalent and trivalent salts. It is an extremely rare metal, ranking 77th in order of abundance of the elements in Earth’s crust. The atomic weight of iridium is 192.22. It melts at about 2446°C (about 4435°F) and boils at about 4428°C (about 8002°F). Its specific gravity is 22.6, making iridium more than twice as dense as lead.
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Iridium information, including Technical Data, Safety Data and its properties, research, applications and other useful facts are discussed below. Scientific facts such as the atomic structure, ionization energy, abundance on Earth, conductivity and thermal properties are included.
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