NevadaBill
fully equipped rock polisher
Member since January 2019
Posts: 1,332
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Post by NevadaBill on Mar 24, 2019 15:34:03 GMT -5
Good day! I am hoping to get some idea of how these rock(s) were created. I had put this in another post an hour ago, along with others, but when I hit "Create Thread" just now, I got a Cloudflare error, and lost about 45 minutes worth of my work. So here goes .. again. I found this (and other rocks) on the banks of the Colorado River, Nevada. I call them the Mutt Rocks. They are combined off all different colors and types of rocks it seems. But they also seem to have been "twisted" together like salt water taffy or something. There is Agate material twisted in to each of them also. Even though there is some other really course, and very common other rock combined with them. I wonder if I will get anything interesting if I cut them in half, or a cross section? Maybe they can take some sort of polish, but I am doubting it. It is a very course mess. The rocks are a good deal more vibrant colors than the pictures show. Perhaps because I used a white backdrop, and shot it in the sun. So far I have not stumped anyone with my rocks. I am hoping that someone might be familiar with these rocks. Thank you for your help!
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fuss
spending too much on rocks
Member since October 2018
Posts: 250
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Post by fuss on Mar 24, 2019 22:43:19 GMT -5
Cryptocrystalline quartz in various fashions, chert/chalcedony etc. Some interesting banding on the lower section of the large one which may classify it as an agate. Suggestion for id purposes, always photograph rocks dry, and try to supply some easy basic test info such as streak and hardness both are easy to do, and can be done with things you have around the house.
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NevadaBill
fully equipped rock polisher
Member since January 2019
Posts: 1,332
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Post by NevadaBill on Mar 26, 2019 8:28:20 GMT -5
Interesting. Cryptocrystalline. That is the best guess I have so far. Thanks fuss. You know, from an earlier post last month, you actually accurately guessed my "Chert Nodule" Rock ID as well. I just didn't see it. So you get credit for that one too. I had a feeling that this one was either going to be real easy, or real hard for folks here. I tried to do my best on describing it. Yes, all of them have agate (which cannot be scratched) in them. And all of them also have junk, conglomerate, cement consistency, common rock going through them too (softer, grittier, courser). I imagine that I can find more, so I am going to cut these at some point. I will post dry samples too. Thank you for the guess and suggestions! Now I am off to learn about "Cryptocrystalline". I swear that if I go back to school (again), that I will attend a local Nevada university which has geological focussed curriculum.
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NevadaBill
fully equipped rock polisher
Member since January 2019
Posts: 1,332
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Post by NevadaBill on Mar 26, 2019 16:40:32 GMT -5
Here you go fuss . Probably the best I can do. I don't have a saw big enough to cut a larger one, so here is a smaller one with same characteristics. I can't scratch with knife. But the knife will leave a mark, which can be removed with cloth & water. I really would like to know how it was created. It seems as if molten rock types were twisted together, then it was shot up in to the air and landed some place. Here is another which is like it some, but not exactly. More Agate-like
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