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Hi I was wondering what your opinions are on these if they're real or fake, or any work done on them ?

There's two of them.

Labeled as - Lacustrine Stromatolite colony's, no work done on them. 

First -  from the Permian age, Lauterecken formation, Germany

Second - from Oligocene age, Rhineland Germany

 

 

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stx506gtg__00223.1582936186.jpeg

stx506v__09274.1582936187.jpeg

stx801ff__20294.1588360639.jpeg

stx801yhy__69354.1588360639.jpeg

stx801yhyaaaah__35872.1588360648.jpeg

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FranzBernhard
34 minutes ago, Abyss said:

no work done on them.

I think there is no need to fake them, but I am wondering how they are found? Internet search reveals many specimens of this type. Are they silicified and etched from their matrix? Gloss looks unnatural, but possibly they consist of chalcedony nowadays? No, seem to be still composed of carbonates. Maybe they are lacquered in some way?

Here is a paper showing the different types of stromatolites in the formations of that area (in German, pdf):

Stromatolites

@Ludwigia, @Pemphix. Thank you!
Franz Bernhard

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Sorry, but I'm not at all familiar with these things, although they do look real to me, if not somewhat enhanced with lacquer or some similar substance.

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They all look legit to me. They have been stabilized with something. I'm just guessing, but looks like some rather heavy coats of PVA or the like.

I have no reason to believe any market for faked stromatolites exists, however stranger things have happened. I do know that there is a bit of a market for them where a section has been sliced and polished to show off the layers.

 

 

All very nice specimens, I'd display them in my collection!

 

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3 hours ago, Abyss said:

Hi I was wondering what your opinions are on these if they're real or fake, or any work done on them ?

There's two of them.

Labeled as - Lacustrine Stromatolite colony's, no work done on them. 

First -  from the Permian age, Lauterecken formation, Germany

Second - from Oligocene age, Rhineland Germany

 

 

stx506gt__03016.1582936178.jpeg

stx506gtg__00223.1582936186.jpeg

stx506v__09274.1582936187.jpeg

stx801ff__20294.1588360639.jpeg

stx801yhy__69354.1588360639.jpeg

stx801yhyaaaah__35872.1588360648.jpeg

Find some literature about stromatolites from these formations and compare colonies.
 

There is no concern that they are faked. The question is: are they stromatolites. Look for layering in cross section. You do not want to see pillar structures that sponges or stromatoporoids might have. You also do not want to see layers that grew around crystals (such as botryoidal chalcedony around quartz crystals). The layers should show growth from a substrate (bottom). You should not see a collection of concretions that each formed from a separate point.

 

See my photo of a silicified Miocene lacustrine stromatolite found in central Arizona. Note the layers that  start in the lower left and show growth upward and to the right.

1CA09C13-ECDA-4DAB-BAA4-C3FD9983FBF0.jpeg

 

See diagram of pillars from https://woostergeologists.scotblogs.wooster.edu/2017/02/17/wooster’s-fossil-of-the-week-a-stromatoporoid-middle-devonian-of-central-ohio/

 

A3F9636C-55F4-4952-A007-6C7E51B47606.jpeg

Edited by DPS Ammonite
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