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clock my rock?

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Fuzzy
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07 May 2010, 11:04 am

justMax wrote:
Fairly certain it's a metamorphic type from the banding and grains, my reflex was to say granitic gneiss.

It's smoothed a bit though, very interesting.


Likely yes. Cant see it not being metamorphic.

Its the ultra fine grain, the band warping, the polish and the homogeneity that makes it interesting. We have lots of rocks like in your picture too.

I really need to go back there and look for more.


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justMax
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07 May 2010, 3:18 pm

Yeah, the large grains are odd, can't find something quite like it, but like I said first thing in my head was "granitic gneiss?" but it's been years since I was a lil' rockhound.



0_equals_true
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08 May 2010, 5:33 am

sinsboldly wrote:
0_equals_true wrote:
It looks very flint like to me.


oooh, I grew up near the flint hills in Kansas, and flint is a striated sedimentary rock and very flaky.

http://en.wikipedia.org/wiki/Flint_Hills

mainly limestone and shale

flint is fairly hard and breaks to form sharp pieces which is why it was used to make tools and sparking fires by prehistoric man. flint and chert are pretty similar if not the same.