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Identify This Rock!
- Thread starter crjmurray
- Start date
Subduction Zone
Regular Member
To get a fresh surface you may have to break the rock. It is much easier to identify individual minerals if they have not been exposed to weathering. And the clear glassy pieces that you would be looking for are the size of one crystal of the rock, so you might miss them if you don't have a fresh surface.
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Subduction Zone
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Mountain building, from orogeny:
https://en.wikipedia.org/wiki/Orogeny
ETA: I just noticed that orogeny seems to have the same root as Spanish "Oro" or gold. Sadly the etymological dictionaries do not seem to agree with me.
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Subduction Zone
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Okay, did some research on your latest info. It is probably a nepheline syenite. That is a granitic rock, meaning it is made mostly of lighter density minerals but it is not a granite since it has little to no quartz. So you not seeing quartz sounds more than reasonable.
https://arkansasgeological.wordpress.com/tag/nepheline-syenite/
The good news is that glaciers never reached as far south as Arkansas. So it is not a glacial erratic. If you want to find more I would either look right where you found it or see if there are any uphill possible sources for it. You said "on a mountain". Your best bet is to climb straight up from where you found it. Good luck. Here is some music to help you on your way:
I was never too fond of "Jackie Blue".
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Subduction Zone
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Faulting, perhaps caused by the uplift of the source of the rock. I don't think that they are all that regular. They are almost at 90 degrees to each other and that is not common.
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Oafman
Try telling that to these bog brained murphys
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It is natural, those look like mineral veins (probably some sort of quartz), which would be very difficult to produce artificially; the pressure, temperature and time required for them to form is very hard to substitute. It is unusual that these are so close to perpendicular, but not impossible as SZ has explained.
I guess they could be painted on to look like mineral veins. To show they're not, we need @crjmurray to go back up the mountain, this time with a geology hammer, find the rock again, and smash it in half. A pair of safety goggles are recommended, and protect me from any liability for the cost of subsequent eye surgery.
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I have no geology qualification at all, so I'm at least as expert in the field as any YECer.
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