FELL FROM THE SKY

I was looking forward to watching the Shooting star display tonight but its all cloudy here. But talking of things shooting across the sky, this stone literally fell from the sky a couple of days ago. I was sitting in the garden having a cup of tea when I spotted a white thing drop from the sky, hit the lean to roof and fall onto the path. I went over to have a look to see what it was and found this. It looks very much like quarts but it is completely see-through inside. Its also very shiney. I'm guessing a bird must have picked it up thinking it was bread or something then dropped it as he flew over my garden.