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Author Topic: Can some one identify this rock?  (Read 3396 times)

Offline JRajotte

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Can some one identify this rock?
« on: 22/01/2013 03:47:56 »
This is a rock that I have found in northern Quebec. I have tried scratching the stone with and iron nail and a quartz piece. The nail was unable to scratch it, while the quartz piece seemed to not affect it. I have tried pouring vinegar onto it but there was no apparent reactions. It did manage to attract a strong magnet, but not strongly enough to have a neodymium stick to it.


 

Offline RD

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Re: Can some one identify this rock?
« Reply #1 on: 22/01/2013 10:46:48 »
Presumably the paper is white ...



It looks like iron slag which has been shaped by a mould.
« Last Edit: 22/01/2013 11:03:10 by RD »
 

Offline JRajotte

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Re: Can some one identify this rock?
« Reply #2 on: 22/01/2013 13:13:53 »
I can tell you it is not an iron slag. There has been no smelting activity in the area, the magnet is very weekly attracted to it and I would have been able to scratch it with my quartz sample. Also when I scratched it with an iron nail it left a metallic mark onto it revealing that it is harder then the iron nail.
« Last Edit: 22/01/2013 14:33:01 by JRajotte »
 

Offline Bass

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Re: Can some one identify this rock?
« Reply #3 on: 23/01/2013 05:37:43 »
I was going to suggest ilmenite, but you should be able to scratch it with quartz.
 

Offline RD

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Re: Can some one identify this rock?
« Reply #4 on: 23/01/2013 06:40:51 »
I can tell you it is not an iron slag. There has been no smelting activity in the area

Iron slag is recycled: transported from where it is created.
So you don't need to be near a smelter to find it.

Hard + vesicular would apply to vesicular basalt
but that wouldn't attract a magnet, (I'm sticking with iron slag,
the piping feature running across it could be a dribble of liquid slag, rather than due to a mould)


Quote
Vesicles and metal together in the same "rock" are a good field mark for slag.
http://meteorites.wustl.edu/id/vesicles.htm
« Last Edit: 23/01/2013 15:24:16 by RD »
 

Offline Bill S

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Re: Can some one identify this rock?
« Reply #5 on: 23/01/2013 20:07:12 »
Quote from: RD
Hard + vesicular would apply to vesicular basalt
but that wouldn't attract a magnet,

Occasionally one can find a basalt which contains sufficient magnetite to make it very faintly magnetic, but I've never seen a specimen that looked quite like this one.  (Sadly) I must go with the slag. 

jrajotte, are you near enough to a museum with a geologist to be able to get a professional opinion?
 

Offline JRajotte

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Re: Can some one identify this rock?
« Reply #6 on: 24/01/2013 03:26:47 »
Quote from: RD
jrajotte, are you near enough to a museum with a geologist to be able to get a professional opinion?

I will try finding someone, so far I have found that the closest museum dealing with this subject is Redpath, I will try finding information on identification services and give you details on the findings.
 
Thank you for your help.
 

Offline Bill S

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Re: Can some one identify this rock?
« Reply #7 on: 25/01/2013 00:28:09 »
Is that the Redpath Museum in Montreal?

If so, I envy you the chance to visit.  I believe they have one of Walter Ferrier's collections.  That's something I'd love to see.
 

Offline JRajotte

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Re: Can some one identify this rock?
« Reply #8 on: 27/01/2013 03:47:07 »
I went to the museum to find out that it is closed on Saterdays, so I will have to go there an other day. I did buy an really neat book on geology today,I will look around in it to see if i can find any clues on what that rock is.
 

Offline RD

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Re: Can some one identify this rock?
« Reply #9 on: 27/01/2013 04:50:11 »
You could try posting the photos in a geology specific forums ...

https://www.google.com/search?q=geology+forum

[ I'm still confident it's iron slag, and I'm certain it's not a meteorite].



http://meteorites.wustl.edu/id/slag_pic.2_5.jpg
« Last Edit: 27/01/2013 05:18:51 by RD »
 

Offline JRajotte

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Re: Can some one identify this rock?
« Reply #10 on: 27/01/2013 05:15:10 »
I think I found it could it be scoria?

newbielink:http://www.radford.edu/jtso/GeologyofVirginia/Rocks/GeologyOfVARocks2-3n.html [nonactive]

The one I have must be eroded giving it this round shape and less dramatic crevices.
« Last Edit: 27/01/2013 05:16:45 by JRajotte »
 

Offline RD

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Re: Can some one identify this rock?
« Reply #11 on: 27/01/2013 05:23:28 »
I think I found it could it be scoria?

Scoria isn't magnetic.
« Last Edit: 27/01/2013 05:27:34 by RD »
 

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Re: Can some one identify this rock?
« Reply #11 on: 27/01/2013 05:23:28 »

 

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