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Inclusions in Peña Blanca quartz?
  
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Tobi




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PostPosted: Aug 31, 2019 01:56    Post subject: Inclusions in Peña Blanca quartz?  

Hi,

Yesterday I visited a fellow collector who had several clear quartzes from Peña Blanca Mine, San Pablo de Borbur Municipality, Vasquez-Yacopí mining district, Boyacá Department, Colombia. Some of them had small inclusions, striated, shiny and nearly gold-colored, they reminded me of rutile inclusions that are known from Brazilian quartzes, I'm sorry that I don't have a photo. We both did not know what these inclusions are, does anyone have a clue? Mindat lists for this locality:

Baryte
Beryl var: Emerald
Calcite
Fluorite
Pyrite
Quartz
Siderite

None of them could be the inclusion. So if anyone knows if another mineral (that looks like gold/brown rutile inclusions) is confirmed there, I would be glad :-)

Thanks
Tobi
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alfredo
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PostPosted: Aug 31, 2019 03:06    Post subject: Re: Incusions in Peña Blanca quartz?  

I had some from here that I was convinced were fibrous amphibole, based on their appearance under the microscope, but Dr George Rossman at Caltech studied them and said they were just hollow tubes. The more "golden" colored ones might have some relict iron oxides inside the tubes.
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Fiebre Verde




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PostPosted: Aug 31, 2019 03:28    Post subject: Re: Incusions in Peña Blanca quartz?  

Alfredo wrote:
I had some from here that I was convinced were fibrous amphibole, based on their appearance under the microscope, but Dr George Rossman at Caltech studied them and said they were just hollow tubes. The more "golden" colored ones might have some relict iron oxides inside the tubes.

Alfredo, I suppose you are referring to the yellow-tipped quartz from the [Cabiche - Municipio de Quipama - Western Boyaca] locality, which have flooded the market not long ago.

Tobi wrote:
yesterday I visited a fellow collector who had several clear quartzes from Peña Blanca Mine, San Pablo de Borbur Municipality, Vasquez-Yacopí mining district, Boyacá Department, Colombia. Some of them had small inclusions, striated, shiny and nearly gold-colured...

Tobi, there was a recent article by Ziga, Rakovan, and Emproto in Rocks & Minerals Vol.94, 2019 - Issue 3, discussing the yellow quartz from Cabiche and the possible origin of the yellow fibrous inclusions.
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alfredo
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PostPosted: Aug 31, 2019 05:53    Post subject: Re: Incusions in Peña Blanca quartz?  

No, not the yellow tipped ones. The ones I have are clear on the tips and have the fibres in the bottom half of the quartz crystals, together with some micaceous mineral which gives the XRD pattern of cookeite.
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Bergur_E_Sigurdarson




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PostPosted: Aug 31, 2019 08:07    Post subject: Re: Inclusions in Peña Blanca quartz?  

I've seen this Colombian quartz with fibrous looking inclusions... but to me they had looked like hollow tubes... which I am glad to see that Dr Rossman agrees on.

Many countries deal with problems of correct localities, especially when bought from sellers not at the actual source.

In Colombia few people venture to the actual mine and also the sellers tend to forget or just try and provide a "known" name to the buyer.
I'm not familiar with quartz from Peñas Blancas having those fibrous tubular inclusions ... and I've stayed there a couple of times and seen quite a lot of material there.

Quite close by (in direct line... far and slow by road) there is a lot more coming out.
It wouldn't surprise me if the Peñas Blancas was incorrect... tho it may have come from nearby.

A photo would help more pondering :-P
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