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22 Jan-02:42:32 Re: micro photos of inclusions in quartz (Zbhjzm)
21 Jan-15:32:22 Re: don lum collection (Don Lum)
21 Jan-15:06:37 Re: collection of michael shaw (Crosstimber)
21 Jan-14:45:59 Re: don lum collection (Don Lum)
21 Jan-11:15:25 Re: collection of heimo hellwig (Heimo Hellwig)
21 Jan-08:42:10 Re: franjungle collection (Franjungle)
20 Jan-23:21:46 Re: any help with id? (Alfredo)
20 Jan-19:22:32 Any help with id? (Jedorton)
20 Jan-14:32:00 Re: help with mineral found, san rocendo canyon, mexico (Yazzyenna)
20 Jan-02:00:25 Re: collecting focuses and how they can change (Andreas Gerstenberg)
19 Jan-23:46:36 Re: a bit on the economics of being a mineral dealer (Bob Kerr)
19 Jan-23:26:28 Re: help with mineral found, san rocendo canyon, mexico (Peter Megaw)
19 Jan-23:17:14 Help with mineral found, san rocendo canyon, mexico (Yazzyenna)
19 Jan-18:13:19 Re: collecting focuses and how they can change (Don Lum)
19 Jan-15:08:21 Re: a bit on the economics of being a mineral dealer (Pierre Joubert)
19 Jan-14:00:11 Re: andreas gerstenberg collection (Tobi)
19 Jan-13:56:49 Re: favourite fluorites? (Tobi)
19 Jan-13:39:16 Re: a bit on the economics of being a mineral dealer (Peter Lemkin)
19 Jan-13:14:06 Re: a bit on the economics of being a mineral dealer (Pierre Joubert)
19 Jan-12:26:51 Re: locality for this probable natrolite (?) specimen? (John Medici)
19 Jan-12:13:41 Re: a bit on the economics of being a mineral dealer (Pete Modreski)
19 Jan-11:43:30 Re: unsure about japan law twin, please help. (Roger Warin)
19 Jan-11:38:59 Re: andreas gerstenberg collection (Jordi Fabre)
19 Jan-11:19:56 Re: andreas gerstenberg collection (Andreas Gerstenberg)
19 Jan-07:29:09 Re: franjungle collection (Franjungle)

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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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