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Iridium

irid·​i·​um | i-ˈri-dē-əm

noun

A metal and member of the platinum family, which is often alloyed with platinum to improve workability

Because iridium is often alloyed with platinum, pieces may be marked with text similar to "90% Plat. 10% Irid" to indicate that the alloy is 90% platinum and 10% iridium.

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