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BerylliumWilliam
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Garnets?
Jun 13th, 2017 at 5:00pm
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I found this in my parent's yard between Asheville and Swannanoa. It looks like garnets, but they aren't completely round. Also, could this mean that there are more nearby or would someone have had to have brought it over here? This rock broke off of a much larger rock
  
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JoeM
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Re: Garnets?
Reply #1 - Jun 13th, 2017 at 10:06pm
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That's a nice rock find, William!
Those most likely are weathered "Iron" garnets and looks like they get pretty good size.
What is the host rock? A mica schist or a piece from a pegmatite?
If you figure that out then you can look at a geologic map of that area and see where it might have come from.
Theoretically, that is. Wink
And when you find more you can cut one open and see what it looks like inside!
  
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Tim4d
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Re: Garnets?
Reply #2 - Jun 14th, 2017 at 11:10am
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Looks like garnets  in schist
  
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BerylliumWilliam
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Re: Garnets?
Reply #3 - Jun 14th, 2017 at 12:31pm
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The host rock is a mica schist I believe.
where would i find a geologic map?
  
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Tim4d
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Re: Garnets?
Reply #4 - Jun 14th, 2017 at 1:37pm
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Try https://mrdata.usgs.gov/geology/state/state.php?state=NC and click "view in web browser".  Zoom in and click on the geologic units, and data will pop up.
  
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Tim4d
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Re: Garnets?
Reply #5 - Jun 14th, 2017 at 1:42pm
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The layers function on that USGS map didn't want to work for me, specifically the "open road map" function.  So the only reference points were the county border outlines.
  
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JoeM
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Re: Garnets?
Reply #6 - Jun 14th, 2017 at 5:18pm
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Appreciate the help, Tim. The maps probably won't be much help. They don't get precise enough to locate small plots of land. They are better for an overall look at the area. I just mentioned it because I think a lot of newbies need to learn how to use the USGS services.

That piece of schist probably hasn't traveled too far. The source could be very close by.
  
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BerylliumWilliam
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Re: Garnets?
Reply #7 - Jun 14th, 2017 at 5:18pm
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interesting, thanks!
  
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Tim4d
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Re: Garnets?
Reply #8 - Jun 15th, 2017 at 11:43am
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Yes it takes some searching to find detailed geological maps and it's a crap shoot whether any exist for an area of interest.
  
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