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23 Apr-03:17:50 Re: collection of heimo hellwig (Heimo Hellwig)
23 Apr-02:39:27 Re: what are your favorite specimens and how to shoot them ;-) (Tobi)
22 Apr-21:39:28 Re: the salt cathedral of zipaquira (Franjungle)
22 Apr-18:55:48 Re: the mizunaka collection - bastnäsite (Am Mizunaka)
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22 Apr-01:36:56 Re: what are your favorite specimens? (Tobi)
22 Apr-01:19:43 Re: collection of manuel mesa (Tobi)
21 Apr-23:57:42 Re: the salt cathedral of zipaquira (Franjungle)
21 Apr-16:43:54 The mizunaka collection - rhodochrosite with calcite (Am Mizunaka)
21 Apr-15:42:31 Re: a mineralogical trip through germany / hessen - hesse (Jordi Fabre)
21 Apr-15:06:37 Re: what are your favorite specimens? - (8) (Clarkymk)
21 Apr-15:04:26 Re: the salt cathedral of zipaquira (Franjungle)
21 Apr-12:14:21 Re: collection of manuel mesa (Fiebre Verde)
21 Apr-11:53:43 Re: favourite mimetites? (Heimo Hellwig)
21 Apr-10:37:29 Re: collection of manuel mesa (Manuel Mesa)
21 Apr-10:34:02 Re: collection of manuel mesa (Manuel Mesa)
21 Apr-10:25:22 Re: collection of manuel mesa (Manuel Mesa)
21 Apr-10:13:58 Re: collection of manuel mesa (Philippe Durand)
21 Apr-09:52:41 Re: collection of manuel mesa (Fiebre Verde)
21 Apr-09:46:01 Re: collection of manuel mesa (Tobi)
21 Apr-09:41:13 Re: collection of manuel mesa (Joseph D'oliveira)

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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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