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27 Jul-17:38:44 Re: 1929 ed over rocks and minerals article (John Betts)
27 Jul-17:03:59 Re: 1929 ed over rocks and minerals article (Codydel)
27 Jul-15:01:00 Re: the mizunaka collection - quartz (Am Mizunaka)
27 Jul-12:24:32 Re: collection of michael shaw (Crosstimber)
27 Jul-10:52:08 Chamonix show fifty years (Philippe Durand)
27 Jul-10:17:06 Re: franjungle collection (Franjungle)
27 Jul-02:13:36 Re: the mizunaka collection - quartz (Tobi)
27 Jul-02:13:11 Re: the collection of pierre and riana joubert (Pierre Joubert)
27 Jul-01:41:15 Re: collection of heimo hellwig (Heimo Hellwig)
26 Jul-23:45:13 The mizunaka collection - quartz (Am Mizunaka)
26 Jul-22:55:15 Re: the collection of pierre and riana joubert (Don Lum)
26 Jul-22:41:58 Re: don lum collection (Don Lum)
26 Jul-11:45:13 Re: 1929 ed over rocks and minerals article (Vic Rzonca)
26 Jul-11:37:24 Re: 1929 ed over rocks and minerals article (Jordi Fabre)
26 Jul-11:31:26 Re: 1929 ed over rocks and minerals article (John Betts)
26 Jul-11:28:44 Re: collection of michael shaw (Crosstimber)
26 Jul-11:06:05 Re: 1929 ed over rocks and minerals article (Vic Rzonca)
26 Jul-10:44:31 Re: don lum collection (Don Lum)
26 Jul-10:39:57 Re: 1929 ed over rocks and minerals article (John Betts)
26 Jul-10:20:36 Re: the collection of pierre and riana joubert (Pierre Joubert)
26 Jul-09:58:04 1929 ed over rocks and minerals article (Codydel)
26 Jul-09:51:26 Re: collection of michael shaw (Crosstimber)
26 Jul-06:40:21 Re: collection of heimo hellwig (Heimo Hellwig)
26 Jul-04:06:00 Re: don lum collection (Pierre Joubert)
26 Jul-01:11:13 Re: collection of michael shaw (Tobi)

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What is this?
  
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lissof




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PostPosted: Feb 28, 2017 06:17    Post subject: What is this?  

please can you tell me what is this? thanks


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marco campos-venuti




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PostPosted: Feb 28, 2017 08:52    Post subject: Re: what is this?  

It look as a calcareous deposition on a pebble. Quite probably of biological origin. I would say cyanobacteria. So you would have a young oncolite.
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lissof




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PostPosted: Feb 28, 2017 14:47    Post subject: Re: What is this?  

thank you
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