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Post by Pat on Jun 17, 2023 14:28:31 GMT -5
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chris1956
fully equipped rock polisher
Member since July 2022
Posts: 1,227
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Post by chris1956 on Jun 17, 2023 16:02:50 GMT -5
I am no expert. The outer part kind of looks like chert (right side of right piece that is fractured in 4th photo)? Very interesting whatever it is. Where did you find it?
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Post by Pat on Jun 17, 2023 16:08:00 GMT -5
Rocks belong to a friend. He told me they were from Mexico, or New Mexico. I’ve asked for more information. Interesting.
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AzRockGeek
has rocks in the head
Member since September 2016
Posts: 635
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Post by AzRockGeek on Jun 17, 2023 16:17:02 GMT -5
We have a similar type near Payson Az. They call it Zebra agate, some type of rhyolite nodule.
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Post by rockpickerforever on Jun 17, 2023 18:04:24 GMT -5
My first thought was some kind of rhyolite, or hickoryite?
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Post by hummingbirdstones on Jun 17, 2023 21:20:23 GMT -5
They look like some kind of rhyolite to me, too. Pretty cool rocks!
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Post by Starguy on Jun 18, 2023 1:48:17 GMT -5
Hi Pat. Neat rocks. I’d say rhyolite too.
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Post by rockjunquie on Jun 18, 2023 6:03:06 GMT -5
Yup, rhyolite. Interesting colors for it, though. One picture looked a bit like Sci Fi jasper in color.
Pat It looks like you figured out the pictures. How did you end up doing them?
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Post by rmf on Jun 18, 2023 12:30:03 GMT -5
Pat classic chert. Where from?
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Post by Pat on Jun 18, 2023 12:55:07 GMT -5
Yup, rhyolite. Interesting colors for it, though. One picture looked a bit like Sci Fi jasper in color.
Pat It looks like you figured out the pictures. How did you end up doing them? I posted the first photo. Trouble adding the rest. Thanks to aDave, we see the rest. Want to feel comfortable using Flickr, then check out Cloudinary.
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Post by Pat on Jun 18, 2023 12:57:30 GMT -5
rmf. Are chert and rhyolite related? Thanks.
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Post by rmf on Jun 18, 2023 15:17:30 GMT -5
rmf . Are chert and rhyolite related? Thanks. Chert is sedimentary and Rhyolite is volcanic. Chert has a hardness of 7 when not weathered. Rhyolite should be in the 5-7 range depending on the amount of silica. Rhyolite is just granite that crystalized faster. The chemical/mineral make up of the main minerals is the same as granite just a finer crystal size.
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Post by Pat on Jun 18, 2023 18:43:42 GMT -5
Friend happy for the above discussion.
He says the rocks are from Mexico. Harder than rhyolite. The unusual pattern through him.
I appreciate your help.
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Post by stardiamond on Jun 18, 2023 21:39:31 GMT -5
The nodules look similar to Royal Imperial.
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Sabre52
Cave Dweller
Me and my gal, Rosie
Member since August 2005
Posts: 20,456
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Post by Sabre52 on Jul 10, 2023 10:51:14 GMT -5
Rhyolite from Pinto Mtn. Mexico.
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docharber
has rocks in the head
Member since October 2008
Posts: 693
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Post by docharber on Jul 12, 2023 19:16:13 GMT -5
I would think they're rhyolite, too. It'll be interesting to see how they polish, as the finer grained materials- chert and jaspers- will take a better polish than most rhyolites. This stuff looks coarse grained without a conchoidal fracture I can appreciate from the pics, which would be less defined in most rhyolites. Let us know how they turn out if you decide to cut some.
Mark H./ Docharber
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