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Calcite label states Mexico but no location
  
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steven calamuci




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PostPosted: May 19, 2019 09:23    Post subject: Calcite label states Mexico but no location  

I purchased a flat of specimens at auction, all of the specimens where labeled with country and quarry or mine location, except this specimen. Any idea where this specimen may of come from in Mexico, I have researched calcite from Mexico on Mindat and came up empty. It is possible the label was wrong and its from a different location.


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PostPosted: May 19, 2019 10:14    Post subject: Re: Calcite label states Mexico but no location  

steven calamuci wrote:
I purchased a flat of specimens at auction, all of the specimens where labeled with country and quarry or mine location, except this specimen. Any idea where this specimen may of come from in Mexico, I have researched calcite from Mexico on Mindat and came up empty. It is possible the label was wrong and its from a different location.
Just a guess, but when it is from Mexico, it could be from Charcas, https://www.mindat.org/loc-2296.html , a locality that produces many colourless calcites in different shapes. And I think I have also seen some specimens from Charcas that were similar to yours ...
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PostPosted: May 19, 2019 10:14    Post subject: Re: Calcite label states Mexico but no location  

This may be from one of the mines in Guanajuato, La Sirena or Valenciana?
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PostPosted: May 19, 2019 10:17    Post subject: Re: Calcite label states Mexico but no location  

Kevin Conroy wrote:
This may be from one of the mines in Guanajuato, La Sirena or Valenciana?
Also a very good guess!
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steven calamuci




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PostPosted: May 19, 2019 11:26    Post subject: Re: Calcite label states Mexico but no location  

Thank you, I will look at Mindat to see the specimens, I realize that calcite is such a common mineral and a locale ID will be more of guess than positive ID.
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PostPosted: May 19, 2019 13:30    Post subject: Re: Calcite label states Mexico but no location  

What are the small yellow balls? maybe Sulfur?
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steven calamuci




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PostPosted: May 19, 2019 13:45    Post subject: Re: Calcite label states Mexico but no location  

Unknown, as the original label stated only calcite and viewed with a loupe they appear to have a tannish yellow staining over a white crystal base. Also very small dark inclusions.
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steven calamuci




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PostPosted: May 19, 2019 15:19    Post subject: Re: Calcite label states Mexico but no location  

I found on line a similar specimen that comes from San Luis Potosi, Charcas, Mexico. The small yellow tan balls found on the calcite may be stilbite.
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Kevin Conroy




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PostPosted: May 19, 2019 22:53    Post subject: Re: Calcite label states Mexico but no location  

I was also wondering what these crystals are on the edge of the specimen.


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Jordi Fabre
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PostPosted: May 20, 2019 06:03    Post subject: Re: Calcite label states Mexico but no location  

Peter Megaw wrote:

99% sure that this is from Guanajuato...Cata, Sirena or Valenciana...Veta Madre at least. The fluorescence and habit are typical.
The yellow balls are probably dolomite.

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steven calamuci




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PostPosted: May 20, 2019 19:24    Post subject: Re: Calcite label states Mexico but no location  

Thanks everyone for all help identifying the locale , as to the Mineral Kevin pointed out on the side, it looks to be quartz..
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PostPosted: May 20, 2019 19:45    Post subject: Re: Calcite label states Mexico but no location  

Quartz is the most likely underlying species...is it at all amethystine?
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PostPosted: May 21, 2019 04:36    Post subject: Re: Calcite label states Mexico but no location  

Hi Peter,
Clear quartz with some dark inclusions, no discernible color to indicate amethyst.
Steve
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