Main metal in pennies (4)

I believe the answer is:

zinc

(Other definitions for zinc that I've seen before include "White metallic element usedin alloys" , "Penultimate element (alpha. order)" , "Bluish-white lustrous metallic element" , "Blue-white metal" , "It is used to coat iron against corrosion" .)

I've seen this clue in the USA Today.

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