The Probert Encyclopaedia of Science & Technology

OSMIUM

Osmium is a blue-white metal element of the platinum group, with the symbol Os. It is volatile and very poisonous. It is a very hard and one of the heaviest of known metals. It is obtained from certain sands of South America, California, Australia, and Russia. The alloy of osmium and iridium (osmiridium) provides long-wearing tips for gold fountain-pen nibs.
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