Back in 1986 I was working construction at the Philadelphia North East airport we were adding a building at the base of the control tower to train air traffic controllers, we had to dig over 30 Feet down through clay to reach bedrock and pour the concrete footings, I was in the trench nearest the tower when I saw a dark streak in the clay from the surface, at about 25 feet a hard chunk was sticking out so I got closer and pried it loose with my claw hammer, it was very heavy and mettalic, oval shape and about the size of a pancake, about 2 inches thick and kind of curved inward. a sledge hammer could not put a dent in it. it had a bubbly kind of surface. I cleaned it up and took it home where it sat on my porch for years as a doorstop until my son Jonathan needed something for his Science fair at school so he took the rock. It sits in the science class to this day in a glass case, and they Identified it at Penn state university as a Meteorite, They think I donated it to the school which I suppose I did but they valued it at over $10,000.00 !!!!! Moral...........Easy Come Easy Go