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19 Nov-07:18:20 Re: collection of philippe durand (Philippe Durand)
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18 Nov-16:26:23 The mizunaka collection - quartz (Am Mizunaka)
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18 Nov-15:45:42 Re: mineral names in different languages and their meaning (Pete Modreski)
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18 Nov-11:46:25 Re: mineral names in different languages and their meaning (Alfredo)
18 Nov-09:22:47 Re: information about a rhodochrosite specimen (Matt_zukowski)
18 Nov-09:16:58 Re: information about a rhodochrosite specimen (Marco Campos-venuti)
18 Nov-08:58:29 Information about a rhodochrosite specimen (Charlotte)
18 Nov-06:31:45 Re: assistance in getting locality info for this mexican? orthoclase & amphibole speci (Marco Campos-venuti)
18 Nov-05:25:09 Re: assistance in getting locality info for this mexican? orthoclase & amphibole speci (John S. White)
18 Nov-04:34:09 Re: mineral names in different languages and their meaning (Tobi)
18 Nov-04:07:50 Re: mineral names in different languages and their meaning (Pierre Joubert)

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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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