Abstract
The precious metals; gold, silver, platinum, palladium, rhodium, ruthenium, osmium and iridium, are extremely rare, but have chemical properties that enable them to exist in a wide variety of environments as native metal or simple compounds with sulphur, arsenic, selenium or tellurium. Deposits exist with concentration clarkes of 103 to 104. The metals are dense, durable and attractive to look at and have, in the case of gold and silver, maintained their value as a basis for currency, from the dawn of metallurgical cultures.
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