Mike I am new at rock tumbling also. I have Petoskey stones also. I read that since they are a soft stone you have to be real careful. The book told how to polish by hand. I tumbled mine for about 24 hrs. I used a medium grit. By looking at them, I am afraid to put them back in the tumbler with the polish compound. My plan is just spray them with lacquer. I haven't done it yet. Hope this helps. I am sure someone who has more knowledge and maybe has tumbled Petoskey stones would have more info then me.
I also have what you call 'soft Petoskey stones'. I know those cannot go in the tumbler or be hand polished. The book tells me just to put them in a pretty jar with some mineral oil. I was thinking about trying to spray just one of them with the lacquer and see what happens.
Mike, petrosky stone, as far as I know is a calcite. The coral it originates from has not gone mineral transfer. Of the few petrosky stones I have tumbled, I have so degraded the stone with all the polishes I was left with very little. A stone polisher I know, saves the final polish for the petosky stones after he cabs the original shape. He routinely mass final polished all his cabs I have never been able to final polish my cabs so I use a leather buff and cerium or tin oxide. I suggest if you have some choice samples, put them aside. Larimar is also similar. Do not tumble Larimar. If the only way I could polish petrosky stone was to tumble, I would do 220 for a few days, checking constantly. I would move up to 660 for a week, and run at least two weeks with cerium oxide. There might be some non mineralized organics trapped in the centers of the coral cells. Watch for gas build up. I once tumbled some fossilized buffalo scat and the tumbler had a soupy green mixture. There was no odor, but I suspect the mineralization was incomplete deep into the stones. It leached out with the tumble. Just my perspective on this. I often wondered if the reason the petrosky stone is localized to the Great Lakes region and not near ocean shores is the wave activity and the softness of the stone. If some seem agatized tumbling might work. Just keep a watch on it.
In the beginning was the Floyd, and the Floyd was with Him, and He was with the Floyd. Syd Barret just disappeared, right after the happening. Lita Ford drives a suburban! Big Hair Heavy Metal is dead. Oh weeping and gnashing of teeth, the end is near. The answer is 42. 42! BING! BIG BING!
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hello its mike i just started my pre polish on my petoskey stones i did what you all said and that seams to work fine i left them in 14 houres with 300 then went to 400 ...14h. then 600. 14h. not done yet but they sure look prety good.... ;D thanks for all the help. ......mike
rockpickerforever: Or maybe some other kind of therapy...
Mar 4, 2014 11:28:51 GMT -5
mr.mohs: best I can say is deep breaths. they've gotten me this far hope it gets rolling smooth again soon!! edmohs
Mar 4, 2014 12:41:39 GMT -5
rockpickerforever: Thanks for the suggestion and well wishes, Ed. With the family all coming together, we'll make it through. Aging parents is something everyone has to face at some point. I know a lot of the RTH members already have or are dealing with it now.
Mar 4, 2014 15:11:11 GMT -5
drocknut: Jean hope you get in some rock therapy, the other kind is a bit expensive from what I've been told. Hang in there.
Mar 4, 2014 19:19:17 GMT -5
tumbleon: hi guys, best of wishes and prayers to everyone... just saying hello and goodnight
Mar 4, 2014 20:39:40 GMT -5
rockpickerforever: Thanks, Diane and tumbleon. Was just kidding about the other therapy, Diane, I'm doing okay. Trips to the hospital to see mom filling my days, not much time to play on the flat lap. But it's set up, so if I can get a minute...
Mar 4, 2014 21:05:02 GMT -5
mr.mohs: concerning therapy...I went to a shrink to get my head examined...no help...the doc ran into a rock
Mar 5, 2014 0:41:52 GMT -5
rockpickerforever: mr.mohs, I think we all have rocks in our heads, lol. Thanks, Paul, and mine with yours.
Mar 5, 2014 10:02:53 GMT -5
wireholic: Does anyone know if there are gems/stones or even just colors associated with the 12 step programs? My jewelry is being displayed in a shop that specializes in "recovery gifts" and I'd like to tailor the jewelry to the theme.
Mar 5, 2014 11:41:40 GMT -5
mr.mohs: recovery stones are probably a subjective thing- but the 'Book of Stones' would be a good resource...
Mar 5, 2014 12:39:23 GMT -5
wireholic: Good idea! Not sure if I have that book but I think I have a book on healing crystals somewhere
Mar 5, 2014 13:28:57 GMT -5
The Dad_Ohs: If you don't find your book, you can look up most any stone online and get a metaphysical answer about the stone, what chakras it opens if it works better with other stones or alone, what parts of the body/mind it affects, all that long hair stuff !!! LOL
Mar 5, 2014 19:50:14 GMT -5