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Egg, Concretion, or Neither?


rockguy2000

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rockguy2000

I recently bought the item shown in the attached photos online. (Images show the front and back.) Unfortunately, the seller did not know exactly what it was, so it was sold to me as a 'mystery item'. Is it a concretion, or something else perhaps? The circle within a circle with the raised 'egg-like' formation has me a bit confused. Thank you for your help everyone! **First post - I'd like to say that I'm very grateful and excited to be here.

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Welcome to TFF!

Not an egg.

It looks like an iron concretion.

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rockguy2000

An iron concretion, meaning that it's natural iron that formed that way and essentially rusted? Or man made? Thank you for the response by the way!

 

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Iron concretions are naturally formed iron oxides. Not man made, although they can form around man made iron objects (given enough time.).

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It looks similar to the 'sand pots' that come from the Sahara. At the time I came across one in a rock shop there didn't seem to be a definitive answer for how they form. 

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Moqui Marbles (Iron Oxide Concretions) from Navajo Sandstone, Grand Staircase-Escalante National Monument, UT.

 

 

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18 hours ago, Rockwood said:

It looks similar to the 'sand pots' that come from the Sahara. At the time I came across one in a rock shop there didn't seem to be a definitive answer for how they form. 

I think that is what you have. A lot of Moroccan vendors sell these. They sell them as stromatolites, though I have heard that they aren't. @Tidgy's Dad will remember.

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Tidgy's Dad

Yes, the above link shows my Moroccan "stromatolite" but I don't think that it is. 

Just a concretion or other desert formed geological structure, I think. 

They seem to come from the desert South East of Agadir from areas that are primarily Cretaceous in age. 

But I'm still not positive exactly from where they come, how old they are or what they are. :headscratch:

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rockguy2000

Thank you all for your insight and helpful information! It sounds like it could perhaps be a stromatolite, but perhaps not. Either way, I'm happy to have a unique looking piece (unique looking to me, anyhow) in my collection.

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2 hours ago, rockguy2000 said:

I'm happy to have a unique looking piece

It is.:)

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