Looking into the sky, while walking over to my vehicle I noticed a star that seemed to move. I stopped and asked my friend if he could see what I was looking at. He took a min sighed and looked at the object, and said "what is that?" I noticed then that the object was getting closer. The star object stopped and turned around I noticed then that It was not a star but a reflection of the lights around us. It was dark Diamond shaped and it was about 500 ft. verticle. Its edges glinted from the lights around us. It was a square or diamond shaped mirror that you could see through. The contours suggested that it was not flat but edged and not rounded. It shook dropped about 5-10 feet then shot in a western direction. When leaving the area it was almost impossible to see when it began to shake.