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Post by Jugglerguy on Jun 13, 2015 20:09:21 GMT -5
Yep, I used denim from an old pair of jeans. I sprinkled a little AO on and put a few drops of water with it. I left the denim laying on a table and vigorously rubbed the rock on it. It was pretty quick to take a polish. Usually I use a felt wheel on a Dremel with Zam, but I think I got a better shine this way. I'll be trying AO with the Dremel next time I do a batch of Petoskeys.
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Post by Drummond Island Rocks on Jun 14, 2015 12:51:35 GMT -5
that came out really good Rob. My kids have hand polished some that came in kits. The kits used A/O on coruroy (piece of pants) and they came out just as good as what I have done on wheels. The geology department at MSU has the same instructions that our kits came with listed on their website. geo.msu.edu/extra/geogmich/petoskystone.htmlI am curious why you use the dremel for your final polish after the flat lap? I use a 3" diameter by 1" buff with zam on my drill press so I can hold the stone and move it around rather then trying to move the dremel. Could just be preference. Chuck
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jamesp
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Member since October 2012
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Post by jamesp on Jun 14, 2015 13:37:48 GMT -5
Rob, this is one of the rocks you sent me in the 'do not tumble' bag. I defied you and tumbled it anyway. If you say don't, I will... Bet it would look cool hand polished. Amazing detail. Love this rock. Is it (ruglose--coral (sp)) ?
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Post by Jugglerguy on Jun 14, 2015 14:48:46 GMT -5
Chuck, I have not quite figured out how to get a good polish on my flat lap. I go through 1200 grit and they're not quite shiny at that point. I use the Dremel because I have felt wheels for it and it works fine. I don't really have the right wheels to use with Zam on the flat lap.
James, how far did you go with that fossil in the tumbler? I haven't tried those in the tumbler, but I thought they'd start to go bad in the finer grits. I think it's cladopora, but I'm not very good at identifying fossils.
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jamesp
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Post by jamesp on Jun 14, 2015 16:12:33 GMT -5
I rotary tumbled it for 3 days in coarse grit I think. May have been 7-8 days. Or 2 weeks. Having a lapse. Not sure. Anyway, the definition is awesome. I figured it would polish the same way you do your petosky stones. Then you would have 2 corals prettier than mine.
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Post by rockpickerforever on Jun 14, 2015 17:01:39 GMT -5
Rob, this is one of the rocks you sent me in the 'do not tumble' bag. I defied you and tumbled it anyway. If you say don't, I will... Bet it would look cool hand polished. Amazing detail. Love this rock. Is it (ruglose--coral (sp)) ? Rugose (it means wrinkled) is a colonial coral. Middle Ordovician to Late Permian.
That is awesome. Remind me NOT to send you something with the stipulation NOT to tumble it, lol.
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jamesp
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Post by jamesp on Jun 14, 2015 17:40:37 GMT -5
He made rules rockpickerforever. I would like to see Rob do his magic on this material.
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Post by rockpickerforever on Jun 14, 2015 17:56:13 GMT -5
He made rules rockpickerforever. I would like to see Rob do his magic on this material. li is some interesting stuff. Colonial coral for sure!
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Post by Drummond Island Rocks on Jun 15, 2015 8:32:40 GMT -5
Chuck, I have not quite figured out how to get a good polish on my flat lap. I go through 1200 grit and they're not quite shiny at that point. I use the Dremel because I have felt wheels for it and it works fine. I don't really have the right wheels to use with Zam on the flat lap. James, how far did you go with that fossil in the tumbler? I haven't tried those in the tumbler, but I thought they'd start to go bad in the finer grits. I think it's cladopora, but I'm not very good at identifying fossils. you do not have any felt discs for your flat lap? I know inland makes thin white ones but I have several 1/4" thick pink ones that I used back in my flat lap days of cabbing. I think I still have a new one from an estate sale. let me know if you want to try it. Here are inlands but I never tried them www.inlandlapidary.com/singleproduct.asp?search=felt&partnum=438005I found an old post of mine asking about suppliers for felt pads and it has a photo of my thick pink felt pad. forum.rocktumblinghobby.com/thread/51818/polish-pad-questionChuck
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panamark
fully equipped rock polisher
Member since September 2012
Posts: 1,343
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Post by panamark on Jun 15, 2015 9:07:04 GMT -5
Rob, this is one of the rocks you sent me in the 'do not tumble' bag. I defied you and tumbled it anyway. If you say don't, I will... Bet it would look cool hand polished. Amazing detail. Love this rock. Is it (ruglose--coral (sp)) ? Rugose (it means wrinkled) is a colonial coral. Middle Ordovician to Late Permian.
I am confused. I thought Rugose coral (e.g. horn coral) were solitary corals. I think that coral may be a Thamnopora spp
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jamesp
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Member since October 2012
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Post by jamesp on Jun 15, 2015 13:04:18 GMT -5
Corals tricky to perform taxonomy on. Even modern day coral researchers are freaking out. Interesting since many present day coral reef are very young, like 5000-10000 years old(since the last ice age). Especially shallow corals. And there are a whole bunch of different types. They seem to be rewriting the book on coral recently. They start at the surface with coral species 'A'/genera 'B'/family 'C' etc etc and trace it deeper, to the dark side, to the east side, to the left side, to the sunny side, to the even deeper side, etc etc. and the same coral seems to change so much that they can't see any similarities in the original ABC where it started at the surface. Fossil horn coral and the fossil coral I find in Florida is quite repetitive. So they say. So Univ. of FL. says. But I find several different polyp structures that just can not be the same coral. Sure looks like Thamnopora panamark, according to search of images.
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panamark
fully equipped rock polisher
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Post by panamark on Jun 15, 2015 14:57:52 GMT -5
Corals tricky to perform taxonomy on. Even modern day coral researchers are freaking out. Interesting since many present day coral reef are very young, like 5000-10000 years old(since the last ice age). Especially shallow corals. And there are a whole bunch of different types. They seem to be rewriting the book on coral recently. They start at the surface with coral species 'A'/genera 'B'/family 'C' etc etc and trace it deeper, to the dark side, to the east side, to the left side, to the sunny side, to the even deeper side, etc etc. and the same coral seems to change so much that they can't see any similarities in the original ABC where it started at the surface. Fossil horn coral and the fossil coral I find in Florida is quite repetitive. So they say. So Univ. of FL. says. But I find several different polyp structures that just can not be the same coral. Sure looks like Thamnopora panamark, according to search of images. Yeah, scientists want to sound so......well "scientific", but sometimes I feel they are just pulling stuff out of their rear because it is unacceptable to just say "I don't know". Ha ha. I have a hobby of (trying to) ID tropical fish in Panama. Wow, do the guide books differ in their ID's. And then there is a fair amount of hybridization that the scientists don't have time to deal with. I imagine corals are even less well studied. U of Florida - didn't they have a football club or something? Rob ( Jugglerguy ) they even have a Thamnoporo alpenensis, maybe first IDed in the same quarry in Alpena that you took me to. That place was a real life Jurassic Devonian Park. So cool.
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jamesp
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Post by jamesp on Jun 15, 2015 15:10:42 GMT -5
Funny, the coral expert I took coral hunting said they are into solving these distorted corals the same way they sort differences in fish, by using DNA. I have seen that word alpenensis on other fossils. Petosky coral: en.wikipedia.org/wiki/Hexagonariainclude hexagonaria alpenensis
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Post by Jugglerguy on Jun 15, 2015 15:40:01 GMT -5
My Michigan fossil book also says that rugose corals are horn corals. I have seen these referred to as cladopora, but I don't really know if that's correct. jamesp, I started polishing one like the one I sent you last night and it's getting very shiny by the same method. I did use my flat lap to speed things up though, I want to do a little more work on it and then I'll post some pictures. Drummond Island Rocks, I have some various pads, but they were mostly used with cerium oxide. I've also used them with cerium, and I don't think I should switch to something else and have two separate polishes on the same pad. Next time I order something from somewhere, I'll pick some up.
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Post by Jugglerguy on Jun 15, 2015 15:48:07 GMT -5
In the Wikipedia entry that James linked to, there's also potterensis listed. Mark, that ditch I took you to right by my house is the Potter farm formation, so that's named after an Alpena site too. If you want to read a lot more about Alpena fossils, check this out. There was a bunch of research from the University of Michigan done in Alpena. I spent some time looking for the black fossil last night, but didn't really find that one. They're quite common both here and in Lake Michigan though. Mark, we probably picked some up in Rockport Quarry or on the beach there.
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Post by rockpickerforever on Jun 15, 2015 16:36:22 GMT -5
Rugose (it means wrinkled) is a colonial coral. Middle Ordovician to Late Permian.
I am confused. I thought Rugose coral (e.g. horn coral) were solitary corals. I think that coral may be a Thamnopora spp
Mark, there are both solitary and colonial rugose corals. Yes, horn corals are solitary.
read more
Hexagonaria (includes Petosky "stones", Hexagonaria percarinata) is a genus of colonial rugose coral.
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jamesp
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Post by jamesp on Jun 15, 2015 17:24:22 GMT -5
I think those are carbonate preserved fossils. This one has some transparent areas in it. Too so soft to be silicified. Surprised to see clear area in carbonate formations. Another reason to put the polish to it.
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verhexen
having dreams about rocks
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Post by verhexen on Jun 19, 2015 9:47:47 GMT -5
Wow, that looks awesome! My grandmother sent me some petosky syones a couple years ago and I haven't touched them. Maybe I should give this a try!
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Post by Jugglerguy on Jun 20, 2015 18:48:13 GMT -5
You should!
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