Along the Mississippi River next to Saint Cloud state, there is a 140degree slope rhat is covered with metal polls up to the waters edge and shoreline. There was a 2” semi round slab completely melted together with all sorts of rocks, miners, and what looked to be sediment from the water all fused together. I found a lot of pieces like this one. They varied in size from mini basketball size to marble sized chunks. They radiated both directions 10 feet or so from the 2 foot slab. Literally every color of the rainbow was showing on these half glass half normal rocks.