Iridium
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Iridium is a chemical element; it has the symbol Ir and atomic number 77. This very hard, brittle, silvery-white transition metal of the platinum group is considered the second-densest naturally occur
Iridium
One troy ounce (31.1035 grams) of arc-melted iridium
Hydrated iridium trichloride, a common salt of iridium.
The Greek goddess Iris, after whom iridium was named.
Osmium
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Osmium is a chemical element; it has symbol Os and atomic number 76. It is a hard, brittle, bluish-white transition metal in the platinum group. It was discovered in 1803 by Smithson Tennant, who name
Iridium
…77. This very hard, brittle, silvery-white transition metal of the platinum group is considered the second-densest naturally occurring metal (after osmium), with a density of 22.56 g/cm3 (0.815 lb/cu in) as defined by experimental X-ray crystallography. 191Ir and 193Ir are the only two naturally occurring…
Osmium crystals
Osmium, remelted pellet
Osmium tetroxide (OsO4)
Native platinum containing traces of the other platinum group metals