The half dollar, quarter dollar, and dime coins are clad coins with 3 layers of metal. The 2 identical outer layers are an alloy of 75 percent copper and 25 percent nickel. The inner layer is copper. The outer layers are metallurgically bonded to the inner layer and weigh at least 30 percent of the weight of the coin.
The dollar coin shall be golden in color, have a distinctive edge, have tactile and visual features that make the denomination of the coin readily discernible, be minted and fabricated in the United States, and have similar metallic, anti-counterfeiting properties as United States coinage in circulation on the date of enactment of the United States $1 Coin Act of 1997.
The 5-cent coin is an alloy of 75 percent copper and 25 percent nickel. In minting 5-cent coins, the Secretary shall use bars that vary not more than 2.5 percent from the percent of nickel required. Except as provided under subsection (c) of this section, the one-cent coin is an alloy of 95 percent copper and 5 percent zinc. In minting gold coins, the Secretary shall use alloys that vary not more than 0.1 percent from the percent of gold required. The specifications for alloys are by weight.