Abundances In this table values are given in units of ppb (parts per billion; 1 billion = 109), both in terms of weight and in terms of numbers of atoms. Values for abundances are difficult to determine with much certainty, so all values should be treated with some caution, especially so for the less common elements. Local concentrations of any element can vary from those given here by orders of magnitude.
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Abundance
ppb by weight
ppb by atoms
Universe
3
0.02
Sun
2
0.02
Meteorite (carbonaceous)
670
70
Crustal rocks
1.8
0.2
Sea water
no data
no data
Stream
no data
no data
Human
no data
no data
Notes
Osmium if found as the free element in iridiosmium, a naturally occurring alloy of iridium and osmium, and with platinum-bearing sands and ores.
