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Iridium is a platinum group metal with atomic number 77. Ir is very hard and brittle metal with silvery color. Iridium has great corrosion resistant even at high temperature as 2000C. Iridium is an ideal material for tip of spark plugs and has been used to make crucible for artificial crystals manufacturing
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A crucible is a container that can withstand very high temperatures and is used for metal, glass, and pigment production as well as a number of modern laboratory processes. While crucibles historically were usually made from clay, they can be made from any material that withstands temperatures high enough to melt or otherwise alter its contents