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24 Mar-20:05:30 Re: a mineralogical trip through the states of usa - arizona (Rweaver)
24 Mar-13:31:41 Re: a mineralogical trip through the states of usa - arizona (Rweaver)
24 Mar-13:02:55 Re: a mineralogical trip through the states of usa - nevada (Rweaver)
24 Mar-13:00:15 Re: just some collection statistics (Tobi)
24 Mar-12:57:12 Re: just some collection statistics (James)
24 Mar-12:47:50 Re: collection of fiebre verde (Fiebre Verde)
24 Mar-12:43:22 Re: collection of ricardo (Ricardo Melendez)
24 Mar-12:35:51 Re: collection of fiebre verde (Philippe Durand)
24 Mar-12:31:11 Re: modificación requested for capestang locality (Philippe Durand)
24 Mar-12:19:38 Re: a mineralogical trip through the states of usa - nevada (Crosstimber)
24 Mar-11:51:38 Re: a mineralogical trip through the states of usa - nevada (Rweaver)
24 Mar-10:28:07 Re: collection of michael shaw (Crosstimber)
24 Mar-10:12:51 Re: what is this mineral (Crosstimber)
24 Mar-10:06:16 Re: just some collection statistics (Crosstimber)
24 Mar-09:52:05 Re: what is this mineral (Marouenca)
24 Mar-09:40:24 Re: what is this mineral (Crosstimber)
24 Mar-08:09:32 Re: collection of fiebre verde - chivor (#518) (Fiebre Verde)
24 Mar-07:09:00 Re: collection of heimo hellwig (Heimo Hellwig)
24 Mar-06:52:39 Re: modificación requested for capestang locality (Jordi Fabre)
24 Mar-05:54:57 Re: what is this mineral (Marouenca)
24 Mar-05:51:10 Re: change in french administrative area (Jordi Fabre)
24 Mar-04:35:56 Re: strange "egg" (Jordi Fabre)
24 Mar-04:27:22 Re: just some collection statistics (Carles Millan)
24 Mar-04:22:19 Re: just some collection statistics (Carles Millan)
24 Mar-00:37:13 Strange "egg" (Texasdigger)

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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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