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What is it?
  
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zar24




Joined: 15 Dec 2013
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PostPosted: Apr 16, 2018 08:59    Post subject: What is it?  

Hello every one!
When I was taking some photos, I had found somethings like Wart on rocks. What is this?



photo_2018-04-16_18-28-45.jpg
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Bob Harman




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PostPosted: Apr 16, 2018 09:11    Post subject: Re: What is it?  

Based just on your photo and based on a guess that the photo is of a site in Iran, I would guess that it represents iron containing concretions (or nodules), more resistant than the surrounding rock, probably a limestone or similar. Note that there appears to be a bit of iron oxide staining in the immediate matrix area of the intact and former concretions. Also note how the resistant concretions stick out of the surrounding rock and there may also be a couple in the weeds on the ground. BOB
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alfredo
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PostPosted: Apr 16, 2018 09:22    Post subject: Re: What is it?  

Perhaps those iron oxide concretions were originally pyrite nodules and they oxidized.
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zar24




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PostPosted: Apr 16, 2018 12:11    Post subject: Re: What is it?  

Thank you BOB!
Thank you Alfredo!
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Kevin Schofield




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PostPosted: Apr 17, 2018 15:39    Post subject: Re: What is it?  

Your host rock looks like a limestone, possibly "chalky" and your concretions have a reniform, spheroidal or "bubbly" appearance that looks very like the marcasite (FeS2, same as pyrite but with a different crystal structure and less stable) found n the chalks of Northern France and Southern/Southeastern England. The brown appearance is due to the fact they they have oxidised (rusted!), but if you break one open, if should have a radial crystal pattern emanating from the middle of each spheroid.
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zar24




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PostPosted: Apr 22, 2018 10:01    Post subject: Re: What is it?  

Thank you Kevin!
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