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The Clue

Metal used in mirror coating (7 letter answer)

The Answer

RHODIUM

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Notes

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

Related Clues

Element used in electroplating
Rare element in platinum ores

Definition

RHODIUM as a noun:

1. (rhodium, Rh, atomic number 45) = a white hard metallic element that is one of the platinum group and is found in platinum ores; used in alloys with platinum