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Post by chris1956 on Feb 28, 2024 21:20:49 GMT -5
I am wondering if people think this is jasper replaced petrified wood. I find a few little pieces of petrified wood around here in northwest Missouri which are typically easy to identify as petrified wood. Then, there are these "jasper" things like the one in the photos below. The jasper in this rock is typical of the brown/redish jasper I find around here. But the layering in this rock and the "waxy" surface makes it look to me like petrified wood. You can see in this pic that the layers are slightly curved like you might find in a larger section of wood.    Here are pics not wet. Kind of has the "waxy" surface you see on most of the petrified wood.    Opinions? Thanks Chris |
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Post by victor1941 on Feb 28, 2024 22:25:05 GMT -5
It appears the cracking could be related to yearly growth rings that cracked before silicification. Once cut I think you might have an answer.
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Post by velodromed on Feb 29, 2024 6:33:44 GMT -5
It could be petrified wood, but it could also be banded chert. What looks like growth rings may just be layers that you’re seeing. You won’t know till you cut it or start tumbling it. The waxy appearance on the surface is pretty common with most micro and crypto crystalline silica rocks, like Jasper, chert and agate. Are you going to cut it or tumble it? If you cut it, you’ll know right away. If you tumble it, it might take a few weeks to wear through the Outer layers.
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Post by chris1956 on Feb 29, 2024 9:45:03 GMT -5
It appears the cracking could be related to yearly growth rings that cracked before silicification. Once cut I think you might have an answer. Thanks. On the surface there are slight grooves where you see the dark lines between layers. I will take a look at it again and see if I want to cut or tumble. It could be petrified wood, but it could also be banded chert. What looks like growth rings may just be layers that you’re seeing. You won’t know till you cut it or start tumbling it. The waxy appearance on the surface is pretty common with most micro and crypto crystalline silica rocks, like Jasper, chert and agate. Are you going to cut it or tumble it? If you cut it, you’ll know right away. If you tumble it, it might take a few weeks to wear through the Outer layers. Thanks. If big enough I will cut. I will post pics when cut or tumbled if I go that route. |
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Post by chris1956 on Mar 18, 2024 17:47:10 GMT -5
I decided to throw the rock in the QT12 tumbler. It has been through 2 weeks of 30 grit and here is what it looks like now (wet). I will probably let it go a few more weeks in the 30 grit.     Thanks for looking, Chris |
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Post by velodromed on Mar 20, 2024 21:03:04 GMT -5
I decided to throw the rock in the QT12 tumbler. It has been through 2 weeks of 30 grit and here is what it looks like now (wet). I will probably let it go a few more weeks in the 30 grit. Thanks for looking, Chris That is a really cool rock, Chris! It could be a unique banded chert/jasper of sorts. But…it also looks like it could be some kind of petrified plant matter. I’ll be curious to see it in a couple more course runs. |
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Post by chris1956 on May 2, 2024 22:16:33 GMT -5
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Post by velodromed on May 15, 2024 15:09:35 GMT -5
I still think that is a cool rock. At this point I’ve no idea now what it is lol. It’s unique. I have quite a few unique stones that I find around Texas that I’ve had a blast tumbling.
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Post by rockjunquie on May 15, 2024 15:50:05 GMT -5
I have no clue what it is, but it sure is cool. Part of me wants to believe it is pet wood, but I just don't know.
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Post by Peruano on May 15, 2024 16:04:45 GMT -5
Looks like a bunch of layers to me but not regular enough to be biological in origin. I like to see some semblance of patterns in biology butits a big world.
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Post by chris1956 on May 15, 2024 19:28:33 GMT -5
I still think that is a cool rock. At this point I’ve no idea now what it is lol. It’s unique. I have quite a few unique stones that I find around Texas that I’ve had a blast tumbling. Glacial material always comes up with unique stuff like this. Never the same. I have no clue what it is, but it sure is cool. Part of me wants to believe it is pet wood, but I just don't know. I agree. I don't know what it is. I do find some pet wood around here (northwest Missouri). Looks like a bunch of layers to me but not regular enough to be biological in origin. I like to see some semblance of patterns in biology butits a big world. I think the layering did kind of get less pronounced with tumbling. Another day or two and it will be polished and I will post pictures. |
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ThomasT
has rocks in the head
Member since June 2022
Posts: 604
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Post by ThomasT on May 15, 2024 21:43:22 GMT -5
It appears that may be a Feldspar.
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