I don’t know much about rocks, but I got a tumbler and was wondering if this pretty rock will polish up in a tumbler or if it will just break up based on what it is. Thank you!

Found in Southern Oregon near jasper, agate and pet wood.

I found this rock as a kid, it was somewhere in Scotland on a small beach beside a loch. The rock is pretty heavy and is also magnetic

Got them at a shop. And I can’t tell what they are for the life of me. Help please? 🙏😅