15.438 grams.
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No 1964 silver quarter should have a copper layer and they all should be 90% silver, although it is possible that your quarter has tarnished or toned odd and just appeared to look non-silver. Both copper-nickel clad and silver quarters were produced in the mid-1960s with the clad ones being dated 1965 and later while the silver ones were dated 1964, so theoretically it could be struck on a copper-nickel planchet. I would weigh the coin, a silver one should weigh about 6.25 grams (naturally a worn quarter would weigh less) while a copper-nickel one should weigh much less, about 5.67 grams.
34 pounds
A 1997 quarter, like all U.S. quarters minted since 1965, weighs 5.67 grams. This weight applies to both the clad quarters made of a copper-nickel composition and the earlier silver quarters. The dimensions and weight have remained consistent for these coins over the years.
An ounce is a measure of mass, not weight. A quarter weighs 6.4 ounce-weight.
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