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The quarter (short for "quarter dollar") is a U.S. coin with a denomination worth 25 cents, or 1/4 of a U.S. dollar. Formally it is known as a "quarter dollar." It has a diameter of 24.26 millimeters (0.955 inches) and a nominal thickness of 1.75 millimeters (0.069 inches). Quarters that are currently minted for circulation by The United States Mint are composed of outer layers of 75 percent copper and 25 percent nickel, with a core of pure copper. Individual coins minted explicitly for coin collectors can consist of the copper-nickel alloy or a distinctive combination of 90 percent silver and 10 percent copper. History of the Quarter Dollar The United States quarter dollar was authorized by the Mint Act of April 2, 1792. Although the  United States Mint  could have started producing them immediately, the U.S. Mint did not mint the first quarter until 1796. At that time, the United States Mint did not create coins on its own accord. It waited