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Old 05-29-2016, 07:32 AM   #1
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what are these rocks ?


yesterday i was drilling a hole for a fence post. it was kinda close, 1 1/2', from a med size tree(if that matters. doubt it). i was having 1 hell of a time about 1' down. a large root that just didn't want to come out. and, i also found these rocks on the hole. the 3 like rocks, they are very light weight. the other is heavy like a rock. also, it is more black than the pic, and right now it is wet, as i just rinsed it off. and it looks like it has some, (for lack of a good description) bubbles in it. this hole is the only place in the yard i have seen these.
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Old 05-29-2016, 07:45 AM   #2
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Re: what are these rocks ?


On the left is most likely slate. And the right appears to be some form of volcanic rock







https://www.google.com/search?q=volc...w=1307&bih=601
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Old 05-29-2016, 08:01 AM   #3
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Re: what are these rocks ?


thats what i was thinking. but slate has some weight to it. this stuff is really light weight.

how the heck would a volcano rock get way over hear. and isn't lava rock also really light weight ?
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Old 05-29-2016, 08:59 AM   #4
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Re: what are these rocks ?


Flint has sharp edges like that. Could you make an arrowhead out of it?

For the other one maybe something with a lot of iron would give it that weight and dark color.
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Old 05-29-2016, 09:39 AM   #5
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Re: what are these rocks ?


This might help you identify the possible igneous rock on the right.


http://skywalker.cochise.edu/wellerr/rocks/igrocksL.htm
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Old 05-29-2016, 09:43 AM   #6
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Re: what are these rocks ?


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Originally Posted by Fix'n it View Post
how the heck would a volcano rock get way over hear. and isn't lava rock also really light weight ?
From the center of the earth, which you have, too :} Magma becomes Igneous. Glacier movement carried rocks.

There are different kinds of lava with diff. weights.

The one on the left is a sedimentary rock, probably. They vary in weight depending on the pressure that has been on them.

I found some great old Illinois books of rocks on the Internet.

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Old 05-29-2016, 06:41 PM   #7
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Re: what are these rocks ?


The one on the right could be expanded clay, it's used in light weight concrete as a coarse aggregate, we used quite a bit of it when building the top 50 stories on Sears Tower.
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Old 05-29-2016, 07:32 PM   #8
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Re: what are these rocks ?


Although most rocks and minerals come in a variety of forms, I'd vote for shale on the left - flint is usually slightly shinier and not often that dark grey. I agree the one on the right is probably igneous-based and there are thousands of variations. It would be hard to tell without breaking it open to see its interior. The colour suggests high iron content - possibly something called a pyrite concretion.
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Old 05-30-2016, 06:39 AM   #9
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Re: what are these rocks ?


so far, the left one = looks like shale. it looks a lot like this on the inside.
i have yet to find an outside piece, so idk bout that.
https://www.dur.ac.uk/images/unconve...ilpicture2.png

i will bust open the other piece ina bit here.
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Old 05-30-2016, 07:32 AM   #10
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Re: what are these rocks ?


Be gentle in case you have a geode full of amethyst crystals! Unlikely, but for all you know, that could be anything including a small piece of meteor!
Sounds like fun.
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Old 05-30-2016, 07:45 AM   #11
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Re: what are these rocks ?


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Be gentle in case you have a geode full of amethyst crystals!

Unlikely, but for all you know, that could be anything including a small piece of meteor!
Sounds like fun.

that looks perdy

i had thought that it could be. that would be WAY COOL !
and there were several of these, i just chucked em behind the garage. i will look for them.
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Old 05-30-2016, 07:53 AM   #12
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Re: what are these rocks ?


i just googled meteorites. and there are a few that look pretty darned close.
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Old 05-30-2016, 08:00 AM   #13
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Re: what are these rocks ?


Most recent:
http://www.amsmeteors.org/2016/04/il...ril-15th-2016/
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Old 05-30-2016, 09:24 PM   #14
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Re: what are these rocks ?


i now have a bunch more rocks. they are still wet from washing.

the jagged ones are magnetic.
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Old 05-30-2016, 09:57 PM   #15
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Re: what are these rocks ?


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i now have a bunch more rocks. they are still wet from washing.

the jagged ones are magnetic.
Wow!

I was reading about black shale that lies over coal beds in your area. Can look gray.

What would make it magnetic?

I wonder what's down there? Be careful, there is uranium in some rocks, I also read. I really enjoy Geology I was fortunate enough to take a course in Hawaii.

Des your state have mineral rights?

Addendum:

"Aeromagnetic surveys are used for geophysical prospecting. Some variations in magnetic measurements are caused by rocks that contain significant amounts of magnetic minerals (magnetite being the most common). These anomalies reflect variations in the amount and type of magnetic material and the shape and depth of the body of rock. The features and patterns of aeromagnetic anomalies can also be used to delineate details of subsurface geology including the locations of buried faults and the thickness of superficial sedimentary rocks." USGS

Last edited by Nik333; 05-30-2016 at 10:08 PM.
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