I have an ABNORMAL 1957 quarter. What is it, or how can I find out, and is it worth anything?

The Washington quarters from 1932 to 1964 were made of 90% silver and weighed 6.25 grams. The quarters from 1965 on ward are made of copper and nickel are are called clad coins, they actually weigh less 5.67 grams. Over the years due to wear a coin can lose weight but not that much to make it weigh less than a clad quarter. As for the colors that is toning or environmental damage. The coin is not rare for there were 46,532,000 minted at Philadelphia and 77,924,160 in Denver. The mint mark if any is on the eagle side at the bottom below the bow. The coin in the condition you state is worth around 5 to 6 times face value for its silver. That is about what dealers are paying now. If silver goes up so does your coins value. Hope this helps.