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Cobalt is reasonably abundant. It is not rare.

Abundance of cobalt in the earth crust: 25-35 mg/kg

Abundance of cobalt in the sea water: 0,02 microgram/L

Abundance of cobalt in the solar system: 2,3.10-3 atom mole fraction relative to silicon=1.

Abundance of cobalt in the human body: 0,000 002 1 %

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13y ago

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