which us coins are pure silver

[DiAlice]

Based on the provided information and general numismatic knowledge, no United States coins intended for general circulation have been minted from pure silver. Pure silver is generally too soft and malleable to withstand the wear and tear of daily transactions.

The U.S. Mint does, however, produce silver bullion coins for investors and collectors that are considered pure. These modern coins, often referred to as "bullions," are typically .999 fine silver. The most prominent example is the American Silver Eagle bullion coin, which is valued for its high purity and weight in silver.

The common silver coins mentioned in the context, such as dimes, quarters, half-dollars, and silver dollars dated 1964 and older, are not pure silver. These historical circulating coins are made from a durable alloy consisting of 90% silver and 10% copper. While they are highly valued for their silver content, they are not classified as pure silver coins.