Cody
starting to shine!
Member since September 2020
Posts: 27
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Post by Cody on Apr 4, 2021 18:28:44 GMT -5
More specifically (for those familiar/living in Michigan), Tawas. Both stones in the first image look like epidote. The stone at the top I thought appeared to be unakite, but the granite at the top seems all wrong. Is it epidote or unakite (I know unakite contains epidote, but the granite doesn't look like the typical pink feldspar to me.) Second image is of a stone I think may be a form of jasper, someone suggested oolitic jasper, but I'm unsure. All of these stones are a 7 on the mohs.
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saxplayer
fully equipped rock polisher
Member since March 2018
Posts: 1,327
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Post by saxplayer on Apr 4, 2021 18:37:07 GMT -5
Sweet stone in the 2nd pic
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Post by rockjunquie on Apr 4, 2021 18:53:38 GMT -5
The first one looks like unakite to me. The 3rd one is uber sweet, but other than oolitic, I don't know what it is.
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Post by Jugglerguy on Apr 4, 2021 19:03:13 GMT -5
I think the first rock is unakite, although it does look a little odd. Unakite is a type of granite. Some of it looks very much like granite, while others don't look like granite at all. If it looks speckled like granite, it usually doesn't tumble very well. It undercuts the same way granite does. The black parts are the worst. I'm not sure what the bottom rock in the first picture is, but it might be serpentine. It looks slightly like the second rock on this page: mcrocks.com/ftr06-2/AdamsMay2006Page2.html I found a big one like that last week in Lake Huron. It's at 19:30 in this video: mcrocks.com/ftr06-2/AdamsMay2006Page2.html
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Cody
starting to shine!
Member since September 2020
Posts: 27
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Post by Cody on Apr 4, 2021 19:19:27 GMT -5
I think the first rock is unakite, although it does look a little odd. Unakite is a type of granite. Some of it looks very much like granite, while others don't look like granite at all. If it looks speckled like granite, it usually doesn't tumble very well. It undercuts the same way granite does. The black parts are the worst. I'm not sure what the bottom rock in the first picture is, but it might be serpentine. It looks slightly like the second rock on this page: mcrocks.com/ftr06-2/AdamsMay2006Page2.html I found a big one like that last week in Lake Huron. It's at 19:30 in this video: mcrocks.com/ftr06-2/AdamsMay2006Page2.htmlThats Rob! I think you may be onto something with the serpentine, though the sparse pink spots throughout the stone throw me off. I can't make up my mind on it, on one hand it could be epidote with very few pieces of feldspar on it, but the color is a completely different green than what I've seen in epidote. It could be serpentine too, the color matches, but then the pink spots throw me off as well. It's a mystery! Also, you accidentally copied the wrong link for the video, but I'll head to your channel and see if I can find it.
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Post by Jugglerguy on Apr 4, 2021 19:36:37 GMT -5
Oops, here it is:
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Sabre52
Cave Dweller
Me and my gal, Rosie
Member since August 2005
Posts: 20,455
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Post by Sabre52 on Apr 5, 2021 8:54:25 GMT -5
That orbicular jasper seem to be pretty common in the same region the banded iron ( banded hematite and red jasper) occurs. A lot of orbicular jasper started out as ocean sediments.
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Post by stephan on Apr 10, 2021 14:27:44 GMT -5
7+ Mohs definitely rules out serpentine for #2. A 6 is rare. Usually somewhere in the 3-5 range. Plus, it really does look like it.
The orby one and the unakite (my vote also) are sweet.
Remember that unakite is altered granite, so some unaltered granite being attached is not surprising
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