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fluorescent mineral associated with the vesuvianite from Sierra de las Cruces, mexico
  
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Joseph D'Oliveira




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PostPosted: Dec 21, 2017 11:10    Post subject: fluorescent mineral associated with the vesuvianite from Sierra de las Cruces, mexico  

I recently came across a number of vesuvianite specimens from Sierra de las Cruces, Mexico while curating a collection. These specimens have been around for many years but I did find something strangely different about them that I had not previously known.

When exposed to short wave uv light, there is a mineral in the matrix that fluoresces a bright green. (see pictures) Unfortunately, I will be leaving for Tucson shortly and won't have time to investigate this further. Does anyone have an idea as to the mineral that causes the fluorescence in these specimens. (yes I'm being lazy ;-)

Joe



ves1.JPG
 Mineral: Vesuvianite
 Locality:
Sierra de las Cruces, Sierra Mojada mining district, Municipio Sierra Mojada, Coahuila (Coahuila de Zaragoza), Mexico
 Dimensions: 6x5x2 cm
 Description:
 Viewed:  759 Time(s)

ves1.JPG



ves2.JPG
 Mineral: Vesuvianite
 Locality:
Sierra de las Cruces, Sierra Mojada mining district, Municipio Sierra Mojada, Coahuila (Coahuila de Zaragoza), Mexico
 Description:
I apologize for the focus issues but the picture demonstrates the noted fluorescence.
 Viewed:  745 Time(s)

ves2.JPG



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Jordi Fabre
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PostPosted: Dec 21, 2017 15:02    Post subject: Re: fluorescent mineral associated with the vesuvianite from Sierra de las Cruces, mexico  

Opal?
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Joseph D'Oliveira




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PostPosted: Dec 21, 2017 15:43    Post subject: Re: fluorescent mineral associated with the vesuvianite from Sierra de las Cruces, mexico  

Quite possible Jordi, the green is quite reminiscent of hyalite opal. I am working on the collection as a volunteer for a science centre here in Sudbury, I'll have a closer look at the specimens when I return from Tucson in March.
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GneissWare




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PostPosted: Jan 03, 2018 21:34    Post subject: Re: fluorescent mineral associated with the vesuvianite from Sierra de las Cruces, mexico  

BTW, that is a garnet specimen.
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Jean Sendero
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PostPosted: Jan 04, 2018 07:49    Post subject: Re: fluorescent mineral associated with the vesuvianite from Sierra de las Cruces, mexico  

Joe,

the matrix on these is often a mixture of calcite and wollastonite. I have never checked if at this locality they were but in principle, both can be.

Is your matrix hard or soft.

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jean
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Joseph D'Oliveira




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PostPosted: Jan 05, 2018 00:20    Post subject: Re: fluorescent mineral associated with the vesuvianite from Sierra de las Cruces, mexico  

Hi Jean,
Unfortunately I am currently in Tucson enjoying the warm weather before the show starts so I do not have access to the specimens. When I get back in March, I might have some time to work on them after I get my inventory sorted out.

Jean Sendero wrote:
Joe,

the matrix on these is often a mixture of calcite and wollastonite. I have never checked if at this locality they were but in principle, both can be.

Is your matrix hard or soft.

Cheers

jean

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Joseph D'Oliveira




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PostPosted: Jan 05, 2018 00:23    Post subject: Re: fluorescent mineral associated with the vesuvianite from Sierra de las Cruces, mexico  

Gneiss Ware, search mindat under vesuvianite and filter for Mexico.
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Joseph D'Oliveira
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GneissWare




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PostPosted: Jan 05, 2018 22:07    Post subject: Re: fluorescent mineral associated with the vesuvianite from Sierra de las Cruces, mexico  

I spent 3 years collecting at this locality. These are not vesuvianite. The vesuvianites are more elongated in shape. I have several hundred pounds of these in my garage.
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Dennis Beals




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PostPosted: Jan 09, 2018 19:27    Post subject: Re: fluorescent mineral associated with the vesuvianite from Sierra de las Cruces, mexico  

They look like Vesuvianite to me but maybe I'm missing something.
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crosstimber
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PostPosted: Jan 10, 2018 10:10    Post subject: Re: fluorescent mineral associated with the vesuvianite from Sierra de las Cruces, mexico  

Bob,

I agree with Dennis, the crystals in the photo sure look like classic vesuvianite from this locality. The crystals in the photo are tetragonal prisms with pyramid terminations and a small pinacoid typical of vesuvianite. While somewhat squat, the c axis is definitely longer than the other two axes. As you no doubt know, this location is well-known for producing vesuvianite as well as grossular. I'm curious as to what you see in the photo that makes you believe that these are grossular garnets.

Michael
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