No circulating US coin was ever made of pure silver. It's too soft. Most were struck in an alloy of 90% silver with 10% copper added for hardness.
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The silver value is about $6.00. NOTE: The US has never made a pure silver quarter, they are 90% silver & 10% copper.
You don't have a pure silver quarter as the US has never minted a pure silver (99.9% pure or higher) silver quarter. Instead what you have is a 90% silver quarter which would be dated 1964 or prior. The value depends on a number of factors including the date, the mintmark and the condition. But a silver quarter is worth $5-6 in scrap silver regardless of type or condition, however some quarters can be worth significantly more.
The 1950 US quarter is 90% silver and 10% copper.
Silver quarters are NOT pure silver, but rather 90% silver with 10% copper. At current market prices, it's worth around $5.
No circulating US silver coins were made of pure silver. It's too soft. The composition is .900 silver & .100 copper to make the coins hard enough to resist wear. Please see the Related Question for more information.
All silver US coins dated 1964 and before are 90% silver none are pure silver.
The Actual Silver Weight (ASW) is .18084oz of pure silver.
There are 5.625 grams of pure silver in every US quarter dated 1964 or prior.
The US never used pure silver in circulating coins. It's too soft.
It's not pure silver. All circulation-strike US silver coins dated 1964 and earlier contain 10% copper. If in circulated condition, melt value only - about 0.18 times the current price of silver.
No circulating US coin was ever made of pure silver. It's too soft. Silver quarters were struck in an alloy of 90% silver with 10% copper added for hardness. Please see the Related Question for more information.
Pre-1965 US quarters are 90% silver with a value of about $2.50 just for the silver.