bunnyfights
noticing nice landscape pebbles
Member since May 2022
Posts: 83
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Post by bunnyfights on Jun 20, 2022 9:33:36 GMT -5
Back again for some Rock ID learning. Update - I now have a MK 370 which is prob 20 years old but seems to work well, I have fairly sizeable orange and white Jasper nodule (8x4x6). I cut the end off and it looks to me like a mix of Jasper and Agate. Parts of the cut are translucent and parts are opaque. There does seem to be orange-red banding in the mix as well. From what I have been reading the agate classification seems to be somewhat subjective. This nodule was produced within sedimentary material which seems to produce a much less predictable outcome. Thoughts? Cut: Whole Rock:
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ThomasT
starting to spend too much on rocks
Trying to keep the dust down.
Member since June 2022
Posts: 247
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Post by ThomasT on Jun 20, 2022 15:51:58 GMT -5
The image appears to be a beautiful plume of agate.
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Post by rockjunquie on Jun 20, 2022 18:50:47 GMT -5
Yes, likely some kind of agate, but it kinda looks like coprolite, too. RWA3006 Randy may be able to help if it is coprolite. He's the expert. Where was it found?
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RWA3006
Cave Dweller
Member since March 2009
Posts: 4,170
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Post by RWA3006 on Jun 20, 2022 20:43:58 GMT -5
It does look a bit like coprolite on the inside, less on the outer surface. The big question to determine if it's coprolite is what general area it was found.
If I had to guess right now without knowing anything else I would say it's an agate, not coprolite because of the outer surface.
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bunnyfights
noticing nice landscape pebbles
Member since May 2022
Posts: 83
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Post by bunnyfights on Jun 21, 2022 9:03:46 GMT -5
Location was Southern WI. I have a number of other jaspers\agates from this same location. Here is one I found yesterday.
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Post by rmf on Jun 21, 2022 12:43:15 GMT -5
The outside of image 2 looks like a fossilized coral. The inner part looks like the structure was not preserved. It has been my experience that cold water agates like Missouri Lace, Paint Rock/KY/Tennessee agate are softer than the Brazilian and Lake Superior agates. I get a start of a shine at 600 grit when cabbing a Laker but with the softer agates I have to get to 1200 to get the same luster. Once through the 3000 you can't tell the difference.
Image one looks like a mixture of Agate and quartz. the orange is probably from decomposed iron minerals. Pretty stuff
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Post by fernwood on Jun 21, 2022 14:28:22 GMT -5
I agree. The first one looks like what I find in Central WI. Very pretty.
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