I found this 'rock'... What is it? (link with pics)

In this photo

http://www.classmac.com/quarter.jpg

What is that marking in the upper left corner? It looks like two regular dots, with a square corner to above them to the left.

Tossing my SWAG in:

Assuming that it’s a natural formation, it appears to me to be a sedimentary deposit that formed in or was shaped by slow-moving water, possibly in or near a limestone cave. The “crater” and the holes RM mentioned may indicate erosion by dripping water. The scoring on the sides doesn’t look natural to me–it’s too even; is it possible that the sample was moved there from somewhere else nearby?

<shrugs> Or it could be badly-poured concrete, although the closeups look wrong for that.

That does look odd in that photo. But I think it’s a Mars Face sort of thing. I took it from another angle and it does not look nearly as man-made… But it is interesting. Looks almost like worm holes. Here’s the up close shot, about 60K in size:

http://www.classmac.com/holes.jpg

Cheers,

Shay

Hey Magnum

I forgot to post this site last week. Check out the description of petrified palm wood. I couldn’t find any illustrations though, but that is the sort of thing I’m guessing. Chalcedony.

Well , I am no expert , but what I see looks a lot like quartz to me, one reason is that the edges of the quartz-like white mineral where it connects to the area showing the second mineral. look like a crystal formation in the photo of the tiny globules of a second mineral formed in the indented area. And that second mineral looks like orbicular jasper to me . Anyone else feel this way?

Its a leeverite…

ya can just leeverite thar, its just a rock.

:smiley:
it really does look like some form of concretion.

have these people look at it

http://members.tripod.com/~Larus/collectors3.html

IANAG, but my guess is it’s a “sex stone”.

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Just a f*cking rock! :wink:

Just looks like well-worn cement to me :slight_smile:

Wow, a 2 year old thread and they guy still has the pics up on his website…

Yeah, the marking that Mentock pointed out looks like there was something with a hinge or bolts pressed against it… and the smooth curvature and regular texture of the edges make it really look like something artificial. Remnants of a mold used to make something, or a piece that got blasted or carved out of somewhere.

I’m sticking with the ‘top’ surface looking like a sedimentary lake bed. The pitting looks like drip erosion the more I look at it. No idea what caused the lines in the curved sides though. IF I found it, it would either be a paperweight or it would go out into my garden.

Based on your pictures, you might consider that you have a fossilized coral and the mineral replacement is chalcedony. But I really can’t say that with great confidence; while the pictures are good, they don’t provide the detail needed for a more certain ID.

Petrified palmwood, almost certainly. It’s supposed to be exceedingly common in east and central Texas. In fact, it’s even the State Stone! Cool, huh?

Here’s what the mineralogy folks at UT Austin have to say about it, and here’s what some guy has to say on the same topic.

Ahem, a more direct link to the petrified palmwood info at UT Austin.

It looks like a piece of cement/concrete that was originally put down against a screen-like surface and accumulated a buildup of calcite.

I grew up in central Texas - Marlin, Texas to be exact. There was a particular hill where my family would go on picnics, and along the slope of the hill we would find rocks similar to the one you have. A paleontologist was doing a dig in the area once, and we had him identify some of our better finds. Several of our fossils he identified as a chambered nautilus. That could be what you have.

Your piece has the sort of spiral, ribbed shape that would be consistent with what I have seen. The crystalline grid patterns may be the result of the fossilization process.

I’ll be very interested if someone can definitively identify this.

[Charlie Brown]

I got a rock.

[/Charlie Brown]

:smiley:

Very cool, Terrifel. It looks like petrified palm wood is also the Louisiana State Fossil.

My last post to this thread was two years ago, and I thought it died and the OP lost interest. But it’s back, thanks to escortsu.

My links are no longer good, but you might want to compare the outside ring of this Petrified Palm Wood Slab to this view of the original. The original was found in central Texas, and it sure sounds like PPW is everywhere around there. This just may not be the best preserved specimen.