Any advice? found this in my lake and it's very out of place. Found it while searching for sunglasses about 6 inches deep in the sand about 10 meters from the shoreline. It was the only rock I found of any size in a 10 square meter area. slightly magnetic when near a magnet hanging from string...
I needed a MDn fix so I went to hunt the wet sand at low tide. A howling 20-30 mph wind from the north pushed the tide out pretty good. The SandShark and I collected a bunch of bottle caps and other junk along with a burnt looking rock that the detector located. I was about a foot deep in the...