All circulating quarters dated 1965 and later, and most proof quarters, are made of copper-nickel. They don't contain any silver. If you found it in change and it has a D or P mint mark, it's only worth 25 cents.
If your coin has an S mint mark, it's a proof coin that was made for sale to collectors. If it has a copper-colored edge it's also made of copper-nickel and might sell for $2 to $10 as of 05/2010. If it's in a special holder labelled "Prestige Proof", then it IS a silver coin and is worth $12 to $20 depending on its quality.
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Value depends on what kind of error. please be more specific
Neither the US nor Canada have struck circulating silver coins since the 1960s. If your coin is a collector's issue such as a US Prestige Proof, please post a new, separate question with more details.
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The simple answer is that any US quarter dated 1964 or earlier is worth many times its face value because these coins were made of 90% silver. However if a quarter is older than roughly the late 1930s / early 1940s its collector value may be higher than its silver value but that depends on the coin's specific date, condition, and mint mark. For that you have to look at a values guide such as the Red Book, PCGS.com, Numismedia.com, etc.
Ah, the 1999 O silver dollar is a beautiful piece of history. Its value can vary depending on its condition and rarity, but it's always worth more than just its monetary value. Take a moment to appreciate the craftsmanship and the stories this coin holds, my friend.