First of all you asked second this forum is for Native American artifacts and related items if you're positive it has nothing to do with Native Americans whatsoever it should be posted somewhere else and yes I've seen bricks do exactly that I live near the shoreline of the Atlantic Ocean you should see what they look like after a long time in the surf or along rivers for that matter
Ok...I'll go there! geez! you're posting in the wrong forum. This is the NA forum to discuss those things not the rocks you've been posting looking for attention or whatever. You just want to argue over something for whatever reason and need to just stop! I don't know about anyone else but I think the admins need to do something about this annoying person.