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The Clue

Precious metals (8 letter answer)

The Answer

IRIDIUMS

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Notes

The answer IRIDIUMS is so rare that it appears less than once every 2500 puzzles.

Definition

IRIDIUM as a noun:

1. (iridium, Ir, atomic number 77) = a heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium