Iridium is found in meteorites with an abundance much higher than its average
abundance in Earth's crust. For this reason, the unusually high abundance of ...
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, ...
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 ...
Iridium may be a key element in the puzzle of dinosaur extinction. ... In some
parts of the Earth, they have found a layer of the Earth's crust that contains an ...
Jun 10, 2014 ... Pure iridium probably does not occur in nature; its abundance in the Earth's crust
is very low, about 0.001 parts per million. ... Iridium-containing ores are found in
South Africa and Alaska, U.S., as well as in Myanmar (Burma), ...
The K-T boundary clay is is found in thin layers all over the world at ... It's as if
something dumped a huge quantity of iridium on the earth and spread it around
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 ...
Aug 23, 2013 ... Properties, sources and uses of the element iridium.
This element is among the rarest found in the earth's crust, and the total
production and consumption per year is about 3 tonnes. The only isotopes of
Element Iridium (Ir), Group 9, Atomic Number 77, d-block, Mass 192.217. Sources
, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images.