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Mineralogy student here: Very cool find you have there!First of all, there are a couple things we can rule out. It is likely not lightning glass or a meteorite. Lightning glass (fulgrites) are more sandy and dendritic (branch-like) in consistency and often hollow. Not to mention they are usually quite small.A meteorite is unlikely as well for they are usually chondrites (stoney, non-metallic and full of rounded minerals) or achondrites (rock-like). Very rarely, some are the famous chunk-of-metal meteorites we hear of. We do get some glassy minerals from meteorite impacts called tektites, but these are often dark, no bigger than a tennis ball, and teardrop-shaped. They occur as the violent melted splash of whatever the meteorite hits.Having studied minerals for a while now, I can't say I know anything that naturally occurs like this. Even a perfectly formed quartz crystal would take a very long time to deposit, and it would be nearly impossible to create one so clear and imperfection-less. Also the lack of any crystal shape/faces adds to the doubt of it being natural.Odds are good it is just slag glass. How it got there beats me, but the consistency and colour and shape sure make it seem like a by-product of the production of something. A beautiful piece of garbage!Well that's my 3 cents. Anyone else?EDIT: Fun fact! That "wave like" texture you speak of is called a conchoidal fracture, and is typical of glass, quartz, and other minerals that do not like to cleave nicely.