The iron bead, shown above, has scratches that likely formed as it was cooling immediately after an explosion. Perhaps most tellingly, the article reminds us this important fact:
There are clear traces of the landings still in the sand, including tiny pieces of shrapnel and nearly perfect spheres of iron and glass, flash-melted in explosions and quickly hardened again. In some parts of the Normandy coast, they are the only physical reminders of the war. In another hundred years, they will likely be gone.Link