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en.wikipedia.org/wiki/Iridium

Iridium is a chemical element with symbol Ir and atomic number 77. A very hard, brittle, ... Iridium is found in meteorites in much higher abundance than in the Earth's crust. For this reason, the unusually high abundance of iridium in the clay  ...

www.britannica.com/science/iridium

Pure iridium probably does not occur in nature; its abundance in the Earth's ... Iridium-containing ores are found in South Africa and Alaska, U.S., as well as in ...

www.livescience.com/39143-iridium.html

Dec 1, 2016 ... Pure iridium is so rare on the Earth's crust that there is only about 2 parts per billion located in the crust, according to Chemistry Explained.

www.chemicool.com/elements/iridium.html

Abnormally high amounts of iridium have been found in rocks dating to the K-T ... a widely held view that an iridium-containing comet struck the Earth at that time, ...

www.newworldencyclopedia.org/entry/Iridium

Apr 22, 2014 ... Iridium is rare in the Earth's crust, but it is found at higher concentrations in some volcanic flows, suggesting that the Earth's core is richer in this ...

education.jlab.org/itselemental/ele077.html

Since meteors and asteroids contain a higher percentage of iridium than the earth's crust, this iridium enriched layer is seen as evidence that the earth was ...

www.encyclopedia.com/science-and-technology/chemistry/compounds-and-elements/iridium

Scientists have now found an answer. In some parts of the Earth, they have found a layer of the Earth's crust that contains an unusually high level of iridium metal ...

mineralseducationcoalition.org/elements/iridium

Iridium is found in its pure native form and in osmiridium, a natural alloy of iridium and osmium. Iridium is mined from sulfide layers in mafic igneous rocks where ...

www.reference.com/science/iridium-come-9a22503205cd54f0

Iridium is an element that originates in the stars. ... A: Found on Earth in neon signs and lighting, between planets, between stars, in stars and in every galaxy ...