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Normal Topic parking lot find (Read 108 times)
rob23
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parking lot find
Jun 20th, 2023 at 10:14am
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I found this at my job where I park at. I thought the striations were interesting and tumbled some of it. I think it's sedimentary yet it held up okay in the tumbler and got shiny. Any ideas of what exactly it is?
  
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JoeM
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Re: parking lot find
Reply #1 - Jun 20th, 2023 at 8:22pm
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That did polish up nice!
Yep that's some of our local 'squeezed by Africa' rock. All the planes in the rock line up with the black line, or vise-versa, because it's been squeezed with lots of pressure. It's hard to come up with a "name" for the rock because it is a mixture of minerals but read up on the formation of "Quartzite" and "Sandstone".
  
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rob23
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Re: parking lot find
Reply #2 - Jun 21st, 2023 at 9:13am
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Aha! Thanks for the info. With this area being a tad south of the Appalachians that makes a lot of sense and that rock is very old. I do love the stripes on these rocks.
  
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Scott LaBorde
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Re: parking lot find
Reply #3 - Jun 26th, 2023 at 7:48am
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I'd probably call that a gneiss.
  
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