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Offline gerrytaggart

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can anyone tell me what this is??
« on: 20/04/2009 00:24:44 »
Hi, I have an object, I thought it was a rock until i cleaned the dirt off.. it is a very interesting shape and it feels metallic.  I have wondered about its origins and thought someone may have some answers for me.


thank you.


 

Offline frethack

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can anyone tell me what this is??
« Reply #1 on: 20/04/2009 01:28:37 »
Is the green some sort of mineral growth, or is it biological?  Its difficult to tell from the pictures. 

The bottom picture resembles a load cast, but that would mean that the rock is sedimentary (which wouldnt explain the metallic feel).  Maybe something hydrothermal?

Post some closups!
 

Offline RD

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can anyone tell me what this is??
« Reply #2 on: 20/04/2009 01:56:25 »
It's a bust of Charles Laughton as "The hunchback of Notre Dame" ...  :)




But seriously I also though hydrothermal when I saw the tube & vent features,
a bit like JimBob's recent post ... http://www.thenakedscientists.com/forum/index.php?topic=6326.msg246375#msg246375 
« Last Edit: 20/04/2009 02:16:03 by RD »
 

Offline JimBob

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can anyone tell me what this is??
« Reply #3 on: 20/04/2009 02:15:49 »
I REALLY hate to admit this but frethak just might be right. Gerry, does the surface feel like sand paper? It looks like it could be well cemented sand.

(I thought about "Quazi" when I first saw this as well, RD.)
 

Offline gerrytaggart

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can anyone tell me what this is??
« Reply #4 on: 20/04/2009 21:48:53 »
Hi thanks for the replies everyone, the surface does feel like sandpaper...although when I flick it it just gives me a metal vibe.
 erm...as you can tell I'm not the most scientific of men, so I cant really offer much else.
although I have been thinking it could be man made... like residue from a smelting process or something?!?..but it was originally found in a wood in bucks so not to sure if thats a possibility.
 

Offline latebind

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can anyone tell me what this is??
« Reply #5 on: 20/04/2009 22:27:49 »
It looks like an old rusted piece of metal
 

Offline JimBob

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can anyone tell me what this is??
« Reply #6 on: 21/04/2009 00:04:08 »
Gerry,

There is a distinct possibility that it is iron. Is there a peat bog near you? Are the woods near a settlement no longer in existence?

The early Celtic and Norse iron mongers worked iron form "bog iron" which first had to be melted in order for it to be worked. It very well could have been spilled while hot during a raid on some similar scenario.

The area it was found in might be an archeological site.
 

Offline RD

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can anyone tell me what this is??
« Reply #7 on: 21/04/2009 00:25:34 »
...although when I flick it it just gives me a metal vibe.

If it rings like a bell it's hollow, (but not necessarily metal).
 

Offline Solius

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can anyone tell me what this is??
« Reply #8 on: 05/05/2009 03:21:10 »
It looks similar to some siderite(FeCO₃) nodules that I have seen in the Penn. sandstones of the eastern US.
 

Offline JimBob

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can anyone tell me what this is??
« Reply #9 on: 06/05/2009 03:47:09 »
You mean this stuff?

So is it a combination of the two - a load cast cemented with siderite?



« Last Edit: 06/05/2009 03:53:10 by JimBob »
 

Offline Solius

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can anyone tell me what this is??
« Reply #10 on: 07/05/2009 04:29:22 »
You mean this stuff?

So is it a combination of the two - a load cast cemented with siderite?



I was referring to concretionary masses. I don't have any examples, but they form odd shapes. The next time I am in the area, I will photograph one for comparison.
 

Offline JimBob

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« Reply #11 on: 07/05/2009 23:29:27 »
Solus,

I do not believe I have ever seen a concretion that has a negative relief area as this one does. The "mouth" is not a normal concessionary feature. Most often, mineral concretions form around a nucleus, although this in not an absolute necessity.

I would like to see anything that you have found in place.

 
 

Offline Solius

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« Reply #12 on: 08/05/2009 03:34:58 »
Concretions in the  Penn sandstones of the Appalachian Plateau produce some weird shapes. In most places they are roundish, but not there...

I generally don't pick up a rock because it has an unusual shape, but I have one concretion that is a hollowed cylinder. It is in a warehouse in another city, but the next time I am there, I will bring it back.

newbielink:http://home.earthlink.net/~gesuchan/Fossil/Baculite_Mesa_040522/DSCN0215%20Concretion%20-%20Steve%20Wagner.JPG [nonactive] is a link to a photo of an odd one . I don't know where it was found, but it is similar looking to some of the ones found in the App. Plateau region. I'm not much on mineralogy, but I think the siderite weathers to limonite.
 

Offline JimBob

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can anyone tell me what this is??
« Reply #13 on: 08/05/2009 05:01:22 »
I believe those are the inside of the concretions. There are many like this in the Austin Chalk. Limestone matrix, not sandstone. And the iron is pirite, not siderite.

And I am not a mineralogist, either - you can see I still use my 40 year old text book, above.

I was up near London very briefly last Sept. What is the conglomerate near the top of the Penn? I couldn't get the geologist I was with to stop to let me sample it. He was more interested in showing me the wells he was trying to sell me.
 

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can anyone tell me what this is??
« Reply #13 on: 08/05/2009 05:01:22 »

 

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