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Please help identify these mineral component of carbonate
  
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mineralowitz




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PostPosted: Jun 21, 2018 05:33    Post subject: Please help identify these mineral component of carbonate  

Hello,

Could someone help?



1.jpg
 Mineral: Carbonate
 Description:
Kraków
1
Is this brown dark algae?
 Viewed:  877 Time(s)

1.jpg



4.jpg
 Mineral: Carbonate
 Description:
Kraków
1
Is it sparry?
 Viewed:  874 Time(s)

4.jpg


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Bob Harman




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PostPosted: Jun 21, 2018 05:47    Post subject: Re: Please help identify these mineral component of carbonate  

You have posted the same 2 photos for identification on the Mindat website.

You need to do some testing to get some help.

If your first photo suggests "algae" to you? If so, soak it in a soapy water/bleach solution for a couple of hours, then wash it and rinse it with a strong stream of water. The bleach should remove any organics including much of the algae. BOB
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mineralowitz




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PostPosted: Jun 21, 2018 06:36    Post subject: Re: Please help identify these mineral component of carbonate  

Ok, but unfortunately I have only thin section so I can't soak it.
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Vinoterapia




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PostPosted: Jun 21, 2018 11:07    Post subject: Re: Please help identify these mineral component of carbonate  

The first picture is somewhat dark and I cannot distinguish any kind of structure, maybe showing a wider field of view can help in determining what that dark spot is.

Your second picture shows several globular objects that may represent small foraminifera and/or radiolaria, even some quartz grains appear to be present ( irregular to elongated ).

If you have access to a library, try to borrow a copy of the AAPG Memoir 77; "A color guide to the petrography of carbonate rocks: grains, textures, porosity, diagenesis". Peter A. Scholle and Dana S. Ulmer-Scholle. 2003 / 2006 second ed.
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mineralowitz




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PostPosted: Jun 21, 2018 11:25    Post subject: Re: Please help identify these mineral component of carbonate  

This is full picture. But for sure it's a form of bioclast?


carbon.JPG
 Mineral: carbonate
 Description:
Kraków
1
 Viewed:  775 Time(s)

carbon.JPG


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Vinoterapia




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PostPosted: Jun 21, 2018 11:46    Post subject: Re: Please help identify these mineral component of carbonate  

Sorry, I can not discern any structure that I would associate with algae, but I could be totally wrong.

Have you considered the possibility that your sample might be affected by burrowing? that may help to explain the differences in light transmission across the thin section. Take a close look at the hand sample if you still have it, these structures have a wide range in size depending on the organism that created the burrow.
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Kevin Schofield




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PostPosted: Jun 22, 2018 10:04    Post subject: Re: Please help identify these mineral component of carbonate  

mineralowitz wrote:
Hello,

Could someone help?


What you appear to have here are thin-section of biomicrites (bioclastic wackestones sensu Dunham) exhibiting a classic "grumeleuse" texture...a French term for "porridge-like" that was popularized by Robin Bathurst in the UK in the seventies.
I'm guessing that these are Devonian or Carboniferous rocks, and that being the case the micritic clots with a chain-like appearance in the first and third pictures may indeed be micritized blue-green algae.
The circular sparry features in the second photograph (most prominently centre-right) are calcispheres. In Palaeozoic rocks they are of uncertain origin, and have been variously described as the reproductive cysts of green algae, radiolaria or dinoflagellates. But again, an association in Palaeozoic rocks with photic-zone blue-green algae is common.
The second photo also has what may be some very heavily micritized foraminifera, most notably in the centre right at the bottom, where a three-chambered form can be discerned (ish!).
If you want to get some book-learning, the two classic texts are:
Carbonate Sediments and Their Diagenesis by Robin Bathurst (elsevier pub), and
Microfacies or Carbonate Rocks: Analysis, Interpretation and Application by Erik Flugel (Springer pub)

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mineralowitz




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PostPosted: Jun 29, 2018 04:33    Post subject: Re: Please help identify these mineral component of carbonate  

Thanks for your help. I borrowed these books and I can say that they are very helpful.
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