A chunk of glass that I found walking to school one day in like 1997. It's like an inch thick. No idea where it would have came from. If I can find a picture when I get home I will upload it. Now it just reminds me of childhood wonder.
Could potentially be a chunk of a glass insulator? Did you find it under or near telephone lines at all? A pic would be useful - I collect insulators so I might be able to tell you whether or not it’s part of one.