what is a 1972 silver dollar made of

[AlexisLynn]

The provided search results do not contain the relevant information to answer this question. Based on general numismatic knowledge, the composition of a 1972 dollar coin, known as the Eisenhower dollar, depends on the specific version of the coin.

The majority of 1972 Eisenhower dollars, which were intended for general circulation, contain no silver. These coins are made of a copper-nickel clad composition. They have outer layers of 75% copper and 25% nickel that are bonded to a core of pure copper. These were produced at the Philadelphia (no mint mark) and Denver (D mint mark) Mints.

In addition to the circulation coins, the U.S. Mint also produced special uncirculated and proof versions for collectors. These coins, struck at the San Francisco Mint and bearing an "S" mintmark, are composed of 40% silver. This silver-clad coin has outer layers of 80% silver and 20% copper over a core that is approximately 21% silver and 79% copper. So, while often called a "silver dollar," only the collector versions from 1972 with the "S" mintmark actually contain silver.