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Post by rockjunquie on Oct 30, 2021 16:55:21 GMT -5
I bought a lot of what was called Peruvian cabochons about 25 15 years ago or more. One I think for sure was, but there was room for doubt. The others, I'm not so sure. So, here is this one. Sorry it's mounted. This is one I have never sold. I fell in love with it. The rock is hard, like an agate and the black is like a very dark green. The colors are very vivid. I've noticed a boatload of Kentucky agates on eBay lately and the colors remind me of this. Any opinions? It's been nagging me for years.
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Post by rmf on Nov 1, 2021 15:42:48 GMT -5
I have not seen a KY Agate that color or pattern. My opinion would be no. But it is interesting.
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Post by rockjunquie on Nov 1, 2021 15:45:14 GMT -5
I have not seen a KY Agate that color or pattern. My opinion would be no. But it is interesting. Thank you! I needed someone to tell me no. I have no idea what it is, but I love it.
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rockhoundoz
starting to spend too much on rocks
Member since March 2017
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Post by rockhoundoz on Nov 8, 2021 9:36:41 GMT -5
I agree that it's not Kentucky agate. But it reminds me a lot of horse creek chert out of the Tennessee/ Alabama area Ft Payne Formation. Beautiful stone though & really liking your wrapping as well .
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rewdownunder
spending too much on rocks
Member since March 2012
Posts: 357
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Post by rewdownunder on Nov 8, 2021 11:03:48 GMT -5
Great stone but once something is cut into a cab it is often hard to tell a location. There is a guy that sometimes comes to Tucson with agates from Peru. With Covid who knows who will be up this year but I will put the photo on My phone in case I see him. Very interesting.
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Tommy
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Post by Tommy on Nov 8, 2021 19:50:59 GMT -5
It looks opaque like a jasper or rhyolite to me. My first thought was polychrome jasper until I zoomed in and now I think the edges say some kind of wonderstone type material with a black center.
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Tommy
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Post by Tommy on Nov 8, 2021 19:53:37 GMT -5
Yeah I think its a type of wonderstone rhyolite...
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Post by rockjunquie on Nov 8, 2021 20:18:55 GMT -5
Yeah I think its a type of wonderstone rhyolite... I think if you saw it in person, you would change your mind. It doesn't look like rhyolite to me. It has an agate polish. But, hey- ya never know. As was said, it's hard to tell once cut.
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Post by rockjunquie on Nov 8, 2021 20:20:27 GMT -5
I agree that it's not Kentucky agate. But it reminds me a lot of horse creek chert out of the Tennessee/ Alabama area Ft Payne Formation. Beautiful stone though & really liking your wrapping as well . Thank you. I would never have thought of that. Now I have to go look it up.
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Tommy
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Post by Tommy on Nov 8, 2021 20:25:08 GMT -5
I think if you saw it in person, you would change your mind. It doesn't look like rhyolite to me. It has an agate polish. But, hey- ya never know. As was said, it's hard to tell once cut. I'm going with my other wild guess then - Polychrome jasper...
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Post by rockjunquie on Nov 8, 2021 20:33:51 GMT -5
Hmm... The colors look close. How long has polychrome been around? I thought it was fairly new.
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Tommy
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Post by Tommy on Nov 9, 2021 11:26:09 GMT -5
According to the interwebbs, Polychrome was found in 2008 which in rock terms is pretty recently. I've looked at a lot of polychrome in person at various shows and you don't typically see such well pronounced areas of black so I'm still iffy on that as an identification I've worked with it a few times and it generally does take a very high shine to the point where at gem shows you see a lot of trinkets made from it - carvings, eggs, spheres, obelisks, etc. BUT I've also had some that didn't take a shine worth a damn. That being said I've also worked with highly silicified rhyolite that takes a fantastic shine. Edited to add... rockjunquie sorry I accidentally edited your post when I was trying to quote it. I need more coffee... haha
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Post by Rockoonz on Nov 9, 2021 12:36:14 GMT -5
Polychrome hit the market about the same time as OJ, just took longer to become popular. I bought some slabs way back when, still buried somewhere in boxes. I am leaning more towards a wonderstone though.
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Post by holajonathan on Nov 12, 2021 17:25:15 GMT -5
I have no idea what it is, but I second the fact that some highly silicified rhyolite takes an agate-like shine. Some hickoryite falls into that category, for example. (Your rock is not hickoryite.) I wouldn't rule out rhyolite based on the polish. If it's really bugging you, send it to me so you don't have to look at it anymore.
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Tommy
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Post by Tommy on Nov 14, 2021 3:26:56 GMT -5
rockjunquie - by pure coincidence I saw this Polychrome for sale on FB just now. I think it looks more like yours than my earlier example did so anyway... I'm still leaning towards rhyolite
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Post by RickB on Nov 14, 2021 15:32:19 GMT -5
Photo of an assortment of Horse Creek Chert for comparison. It will make a strong color change if heat treated.
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Post by mohs on Nov 14, 2021 16:57:58 GMT -5
RickB revel rock ! is the red oxidation ?
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Post by RickB on Nov 14, 2021 17:55:03 GMT -5
RickB revel rock ! is the red oxidation ? Yep, High iron content aka oxidation. It's some pretty chert, red, yellow and a black/grey mostly.
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