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From Mexico
  
  Index -> FOR BEGINNERS: What is it? Where is it from?
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James
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PostPosted: Feb 28, 2018 14:55    Post subject: From Mexico  

I must have got this as a kid in about 1972. I assume it is from Taxco, but am by no means certain as I used to get things from a small stall in DF. I have always assumed (my old label says) that it was Pyrargyrite but would welcome any views.


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Jean Sendero
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PostPosted: Feb 28, 2018 15:04    Post subject: Re: From Mexico  

Hey James,

Do you have a better pic? I could then try to answer your questions.
But what makes you think pyrargyrite? And Taxco?
Specimen size? Matrix?

Thanks,
Jean
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PostPosted: Feb 28, 2018 15:51    Post subject: Re: From Mexico  

It is from Mexico, that is all I can say. I was only 11 at the time. Streak (gray) suggests I was wrong (stibnite?). Not much matrix to speak of as what you can see is just massive with pockets. No red flashes that we can see.

8 x 8 x 6 cm
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PostPosted: Feb 28, 2018 15:56    Post subject: Re: From Mexico  

Another shot


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John Betts




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PostPosted: Feb 28, 2018 16:34    Post subject: Re: From Mexico  

Looks like stibnite. Have you checked hardness?
Stibnite should not scratch calcite.

I had 2 similar old stibnite specimens from Zacatecas, Mexico.

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PostPosted: Feb 28, 2018 17:05    Post subject: Re: From Mexico  

I agree with John
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PostPosted: Feb 28, 2018 17:49    Post subject: Re: From Mexico  

crystals look like San Martin...is matrix limestone?
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PostPosted: Feb 28, 2018 18:58    Post subject: Re: From Mexico  

There is a chemical test specific for stibnite. It gives a yellow color with potassium hydroxide.
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PostPosted: Mar 01, 2018 04:15    Post subject: Re: From Mexico  

We would have also visited Zacatecas in the early 1970s, so that is possible. Matrix (what little there is) is limestone. There is a small group of baryte on the rear. I also have some boulangerite like material from that time! I sort of remember buying them back then somewhere outside DF, as the forms intrigued me. I do have a number of old specimens from then that I need to go through and get better ID (and maybe locality)
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PostPosted: Mar 01, 2018 09:23    Post subject: Re: From Mexico  

are the barites bladed or blocky and do they overgrow the stibnute?
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PostPosted: Mar 02, 2018 08:12    Post subject: Re: From Mexico  

Pete

Bladed and they do not overgrow the stibnite.

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PostPosted: Mar 03, 2018 10:34    Post subject: Re: From Mexico  

A few more from my youth


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PostPosted: Mar 03, 2018 11:37    Post subject: Re: From Mexico  

First one is Jamesonite from the Noche Buena Mine at Concepcion del Oro, Zacatecas...and your timing is just right. Check closely how these crystals attach to the matrix. These formed as huge spiny masses in open vugs and many were collected by coating a piece of rock with glue and jamming it into the mass with whatever stuck becoming the specimen. They tended to use water soluble white glue so be very careful washing it.

The second is also from Concepcion del Oro and probably also Noche Buena. Hard to tell from the photos but if those gray-black crystals are bournonite it is definitely NB

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PostPosted: Mar 08, 2018 02:49    Post subject: Re: From Mexico  

Peter Megaw wrote:
The second is also from Concepcion del Oro and probably also Noche Buena. Hard to tell from the photos but if those gray-black crystals are bournonite it is definitely NB


I got it from a miner in Angangueo. I remember the trip well as it was the first time we saw Monarchs
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