I found this rock under water over 20 years ago while swimming in Lake Huron near Kincardine, Ontario.
It’s a little smaller than a baseball although it is very dense and a lot heavier than it looks. As you can see it is a shiny silver colour with very little corrosion. It is covered entirely with thumbprint like indents and is also extremely magnetic. It appears to be made up out of many cylinder like slivers of metal which are all fused together.
I’ve spent countless hours online researching and trying to identify it myself with no luck.