You can check to see if it will react with vinegar by adding a few drops of vinegar to the stone's surface and waiting. Here is a picture of the rocks that became smooth and shiny after a couple of years in water with bleach added for keeping the water clean and clear. Wet the stone to be sure it’s a Petoskey. I then carefully heated the water in the double boiler on the stove top until the oil reached 200oF, removed it from the heat and let it sit for 60-minutes--I reheated the mineral oil to 200oF and again removed the heat & let the stones cool in the oil for another hour. Petoskey stones are beautiful stones that can be found littered along the sandy beaches of northern Michigan. Tagged Beaches, Kids, Outdoors. **Keep in mind, it’s illegal to take stones from national parks or lakeshores such as Sleeping Bear Dunes and Pictured Rocks. These stones are actually fossils of colonial corals that lived in the seas that once covered northern Michigan in the Devonian time about 350 million years ago. If there are any scratches or dull spots that remain begin the process again with the 220 grit sandpaper. If you’re rocking hunting on state-owned land, you cannot remove more than the aggregate total weight of 25 pounds, per individual per year of any rock, mineral specimen (exclusive of any gold-bearing material), or invertebrate fossil for individual or non-commercial hobby use. An interesting note is that fossils such as Petoskey Stones do not change at all. Here’s how to polish Petoskey stones. The stones looked perfect for polishing, so I polished them for 5 days in Cerium Oxide and was shocked to see that they had undercut badly and looked worse than they did after Stage 4. You can use either a Polish Stick, a hand buff, a cotton buffing wheel, a flat lap or a vertical polishing wheel to polish the stones. Do this in the same manner as when you used the rougher sandpaper. MyNorth.com is the online home of Traverse, Northern Michigan’s Magazine, the flagship publication of MyNorth Media, a Traverse City, Michigan company dedicated to sharing stories and photos about vacations, restaurants, wineries, the outdoors and more from Traverse City to Sleeping Bear Dunes and up to Mackinac Island. The internet sources recommend that you stop tumbling after Stage 2 and simply hand sand them with wet/dry sandpaper (or) run them on a 600-grit Silicon Carbide or diamond flex-wheel. Petoskey stones, in fact, are the state stone of Michigan. You can purchase kits for … I checked them at the 2-day point to see how quickly they were shaping up, then let them go another day and a half (3 ½ days total). If it hasn't started bubbling within 10 minutes or so, it should be safe. It will contain the dust so that you can cut your stone right at your craft table. If you are inclined to polish a Petoskey stone, you will find that it takes a bit of time, but is relatively easy. Dry: this is how I found the stone on the beach Wet: a little water! They are quite beautiful when you finish them by hand, but I have to admit I was really surprised that they got far … And a picture of the rocks I have done the same to for a year. Sand the stone with the 600 grit sandpaper. If you would like more information about key procedures for rock tumbling (but not Petoskey Stones! Grab some stones and make a day of it (really, you’ll need the whole day). Petoskey Stones are a strange breed. The stone should become even smoother. If the stone is acid safe, soak it in vinegar for a couple of days to dissolve carbonate deposits. Copyright © 2008 - 2020 Prism Publications, Northern Michigan Guides & Resources, Tips For Rock Hunting In Northern Michigan, Top 10 Best Petoskey Stone Souvenir Shops, 6 Tips For Finding Morel Mushrooms in Northern Michigan, Some like to give their stones a bit of rounding off, so first, you can, Apply a small amount of polishing powder or compound to your piece of corduroy or velvet, then use the fabric to. Sand the stone with the 400 grit sandpaper. The undercutting issue prevents normal mass-polishing techniques, and so must be hand polished one at a time. Continue to use this grit sandpaper until the entire stone is smoother than it was previously, and all the coarse spots are gone. Do this in the same manner as when you used the 220 grit sandpaper. This will bring a shine to the rock. When the stones had cooled, I put them on paper towels to draw off the excess mineral oil. I had a strong feeling that Petoskey Stones could be tumbled successfully, but since I had never had the opportunity to tumble them, I went to E-Bay and purchased a large coffee can of Petoskey Stones for an experiment. Continue to use this grit sandpaper until the entire stone is smoother than it was previously and all scratches are gone. Petoskey stone – Spend a morning sifting through the colorful stones that blanket the beaches of the Great Lakes (especially those along Lake Michigan). It’s really nothing to buy a couple of polished stones and toss them in with your sea glass and agates, but you can do one better: exercise that good ol’ Midwestern work ethic and search for your own Petoskey stones straight out of the Great Lakes, then polish them yourself. The key to polishing these little guys is the 600-grit sandpaper, which eliminates the undercutting (undercutting is the erosion of some layers, but not others, thus leaving a rough surface). They are quite beautiful when you finish them by hand, but I have to admit I was really surprised that they got far worse in the polish slurry inside the tumbler. I would have bet a lot of money that they could be tumble polished--I’m glad I didn’t lay a bet down! Using short rotating strokes, rub this paste all over the surface of the stone.
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