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Help ID'ing some oddities please.
  
  Index -> FOR BEGINNERS: What is it? Where is it from?
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cornz




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PostPosted: Oct 17, 2022 12:34    Post subject: Help ID'ing some oddities please.  

Ok, a good friend has asked me if I know what these are. I have no idea and wondered if anyone here had any clue.

Here is a bit of background from him:

This was found in 2010 whilst I was working in the Sistani desert near Marjah, Helmand Province, Afghanistan.

I noticed an odd depression on the desert floor and thought at first it was a trapdoor spider hole or that something had hit the sand hard causing the hole in the sand to be a funnel shape.
Using a wooden probe, I checked gently around the hole and approximately 10 inches below the surface I found this object and nothing else. It is un-reactive to magnets, so I guess it has no ferrous metal content, it weighs approx. 10.5 ounces.



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Peter Megaw
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PostPosted: Oct 17, 2022 12:49    Post subject: Re: Help ID'ing some oddities please.  

We need a little more information than "non magnetic" ...especially hardness...I doubt you can scratch this with a pin or tip of a knife, but that would be the first test I'd recommend

That said, this looks like a chert nodule that has been weathered out of limestone and sandblasted by desert winds.

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James Catmur
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PostPosted: Oct 17, 2022 13:12    Post subject: Re: Help ID'ing some oddities please.  

Hardness is explained here

https://www.mineral-forum.com/message-board/viewtopic.php?p=19487#19487

Numerous ferrous minerals are not magnetic so that is not a great help
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cornz




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PostPosted: Oct 17, 2022 13:20    Post subject: Re: Help ID'ing some oddities please.  

Peter Megaw wrote:
We need a little more information than "non magnetic" ...especially hardness...I doubt you can scratch this with a pin or tip of a knife, but that would be the first test I'd recommend

That said, this looks like a chert nodule that has been weathered out of limestone and sandblasted by desert winds.


Thanks. I've forwarded this onto him and asked him about the objects hardness. I will post his response.
Thank you for the assist.
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cornz




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PostPosted: Oct 17, 2022 13:22    Post subject: Re: Help ID'ing some oddities please.  

James Catmur wrote:
Hardness is explained here

https://www.mineral-forum.com/message-board/viewtopic.php?p=19487#19487

Numerous ferrous minerals are not metallic so that is not a great help


Only passing on what he has told me...
Thanks for the hardness link, forwarded it onto him.
I'll post the response here.
Again, thanks for the assist.
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cornz




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PostPosted: Oct 17, 2022 13:56    Post subject: Re: Help ID'ing some oddities please.  

Further info.

It will not scratch glass, vinegar appears to be un-reactive and a sharp pointed knife will not mark it.

I've asked him to pass it over his *metal detector.

*a decent one.
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James Catmur
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PostPosted: Oct 18, 2022 03:39    Post subject: Re: Help ID'ing some oddities please.  

Suggests that it might be flint/chert given the hardness
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cornz




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PostPosted: Oct 27, 2022 09:22    Post subject: Re: Help ID'ing some oddities please.  

Just a quick thanks to all whom helped my friend ID his rock. He has decided to cut it open and see what it contains.
Thank you.
Cornz
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