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Looking for some help identifying this odd rock I found

0 votes

I saw this rock walking through the woods here in Northeast US. I can't seem to find just one criteria that it fits to identify it. The odd looking weathering/erosion pattern really has me confused too. It looks like it has been "eaten" away in spots.

I haven't dug it up (yet), but would appreciate any help in identifying it's classification.... and maybe the odd erosion pattern.


alt text

asked Apr 24, 2014 by Rocksy (120 points)

The shadow is from a tree that was between the rock and the sun when I found it. When I go back by there I will just dig it up. It's about a foot long at the greatest diameter in the pic. Not sure how much is below ground, but i couldn't pry it up with my hands.

Thank you.

3 Answers

0 votes

Can you take some close-ups so we can see inside those voids? Are they vugs lined with small crystals, or just hollow voids?

answered Apr 24, 2014 by hershel (52,800 points)

So I dug it up. It wasn't deep, but the two rocks nearby had it wedged in place. The voids are hollow. I took some pics before and after I attempted to clean it up a bit. My only guess is that it is some form of quartzite; but I thought quartzite was supposed to be extremely hard. If that's the case, what caused the voids? They were mostly on the top and the side, and not so much on the bottom.

I can't upload photos to the comment section, so here is a link to the album on Photobucket:


Thank you for all the help.

Just hit the pause tab (lower left)and you can click on the individual pics at bottom without them scrolling by.

0 votes

Thanks - saw the additional photos on photobucket. It definintely looks most like a hunk of rounded quartz. Though the only only way to fully confirm is by actual test.

answered Apr 24, 2014 by hershel (52,800 points)

I'm quite a layman when it comes to rockhounding, but I'm really interested in learning. I had a friend bring over some hcl and it didn't react with the stone at all. So Quartz sounds like the right answer. However, I couldn't find one description/picture of the type of quartz I'm looking at here.

How close are Travertine and Quartz related? I saw some pics of Travertine, and was wondering if Quartz could somehow naturally take on visual characteristics of Travertine?

0 votes

You do know how erosion works? I'm thinking there are other minerals in that roch as well and that those minerals have been eroded away.

And it looks like some sort of granite.

Nice find!

answered Apr 25, 2014 by Renata (7,840 points)

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