Rock tumbler UPDATE! I started a barrel of Lake Superior agates 9 days ago and after inspecting them… they were not ready to move onto stage two. I ground out some pits on the stones to hopefully reduce the time these stones need in stage one. I put them back in stage one with the 60/90 grit. We will check back on them in a week and hopefully can move onto stage two! Tumbling rocks takes time and patience! #rocktumbling #tumbling #rocks #lapidary | Agate Dad