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29 May-08:47:20 Re: twenty basic minerals (Peter Lemkin)
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28 May-23:57:45 The mizunaka collection - calcite (Am Mizunaka)
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28 May-14:29:16 Re: collection of tobi (Pierre Joubert)
28 May-14:20:11 Re: cornish chalcocite but from where? (Gneissware)
28 May-13:16:23 Re: a mineralogical trip through the regions of the uk - england / cumbria (Jordi Fabre)
28 May-10:28:46 Re: twenty basic minerals (Gneissware)
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28 May-07:35:44 Twenty basic minerals (Tom Mazanec)
28 May-07:28:25 Re: collection of tobi (Tobi)
28 May-07:25:44 Re: cornish chalcocite but from where? (Tobi)
28 May-07:14:15 Re: calcite location (Tobi)
28 May-06:58:47 Re: calcite location (Vitomorim)
28 May-06:23:13 Re: cornish chalcocite but from where? (Jfc035)
28 May-06:20:32 Cornish chalcocite but from where? (Jfc035)
28 May-01:15:15 Re: collection of tobi (Philippe Durand)
28 May-00:46:50 Re: collection of tobi (Heimo Hellwig)
27 May-21:22:15 Re: calcite location (Joseph D'oliveira)

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Marouenca




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PostPosted: Apr 28, 2017 13:30    Post subject: Help with this new one  

Hi guys this is my new find and i dont know what is it. Can you help me :)


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Bob Carnein




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PostPosted: Apr 28, 2017 16:41    Post subject: Re: Help with this new one  

It could be a number of things. It would help if you could answer several questions: First, where did it come from? Second, how hard is it (can you scratch it with your fingernail? A knife blade?) Third, try powdering a bit of it and put it in white vinegar to see if it bubbles. If it bubbles, it's probably aragonite or calcite, perhaps colored by copper (my first guess). Other possibilities include hemimorphite or smithsonite, both of which should feel anomalously "heavy", compared with average rocks of this size.
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Tobi




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PostPosted: Apr 29, 2017 02:41    Post subject: Re: Help with this new one  

Please read this:

http://www.mineral-forum.com/message-board/viewtopic.php?p=19487#19487
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Marouenca




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PostPosted: Apr 29, 2017 07:58    Post subject: Re: Help with this new one  

Hi, it's found in a mountain in North Africa and it doesn't react to white vinegar. And it is 7 or 8 in hardness. Hope this can help.
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Tobi




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PostPosted: Apr 29, 2017 08:10    Post subject: Re: Help with this new one  

Marouenca wrote:
Hi. it's found in a mountain in North Africa and it doesn't react to white vinegar. And it is 7 or 8 in hardness. Hope this can help
Maybe chalcedony ...
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Marouenca




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PostPosted: Apr 29, 2017 08:28    Post subject: Re: Help with this new one  

Maybe aquamarine like this


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Tobi




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PostPosted: Apr 29, 2017 10:08    Post subject: Re: Help with this new one  

Marouenca wrote:
Maybe aquamarine like this
Definitely not aquamarine, it does not appear in such banded structures. Like I said, it's most likely chalcedony/agate, the microcrystalline variety of quartz, the banded structure is typical.
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Volkmar Stingl




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PostPosted: Apr 29, 2017 12:18    Post subject: Re: Help with this new one  

Marouenca wrote:
Hi, it's found in a mountain in North Africa and it doesn't react to white vinegar. And it is 7 or 8 in hardness. Hope this can help.


Very exact information about the location! If your hardness test is of same exactness as I assume (hardness 7 I would believe, but 8?), it can be a lot of things...
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