Multimedia Gallery - This image shows copper in ore. The penny is 97.5 percent zinc and 2.5 percent copper.

penny – The Coin Roll Hunter

Penny Lab: Determining Zinc and Copper Composition in Pennies

Why would my 1967 penny weigh 1.25? It's really thin but stamped

Solved Part A An American penny is 97.5% zinc and 2.5%

Mine Tales: Mining metals from pocket change

Your penny may be worth $18,000 - the exact 'small date' error to

Copper in the Arts: Issue #106

How Much Copper is in a Penny? You'd Be Surprised

1994 Penny Coin Value (Errors List, D, S & No Mint Mark Worth)

Why are US coins made out of metals like copper and nickel? - Quora

What's in a Penny?

a. Pennies currently being minted are composed of

Pre-1980s US penny are worth more than a penny if melted and sold

Separating Copper and Zinc from a Penny - HubPages