I think you have a gold plated quarter. These were sold on HSN or some other tv shopping show. They are covered with an extremely thin layer of gold. The amount of gold is so small that it would cost more to remove it than the gold is worth -- note the weight of the coin.
After they sold as many as they could and people found out they were worth exactly 25 cent a piece, they started showing up in the wild.
Keep it as a novelty.