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What is it?
  
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Ricardo Melendez




Joined: 21 Apr 2014
Posts: 63
Location: Estado de Mexico


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PostPosted: Feb 16, 2017 12:50    Post subject: What is it?  

Hi friends,

I have a mineral from most probably Naica, but it could also be from Santa Eulalia, Chihuahua, México. The luster is very like the tin welding used in electronic circuits.

It is associated with quartz, galena and calcite, much more harder than molybdenite, but since this is a unique crystal, I do not want to try scratching it.

Here there are many experts in minerals from Northern Mexico. Maybe one of you can help me.

Regards,

Ricardo



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 Mineral: Unidentified
 Description:
Naica or Santa Eulalia, Chihuahua, Mexico.
 Viewed:  1064 Time(s)

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Bob Carnein




Joined: 22 Aug 2013
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PostPosted: Feb 16, 2017 12:56    Post subject: Re: what is it?  

Looks to me like a spinel-law twin of galena.
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John Betts




Joined: 07 Jun 2012
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PostPosted: Feb 16, 2017 13:06    Post subject: Re: what is it?  

Bob Carnein wrote:
Looks to me like a spinel-law twin of galena.


I agree.

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John Betts
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kushmeja




Joined: 28 Jul 2014
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Location: New Jersey

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PostPosted: Feb 16, 2017 13:27    Post subject: Re: what is it?  

John Betts wrote:
Bob Carnein wrote:
Looks to me like a spinel-law twin of galena.


I agree.


I'm also in agreement that it's a spinel twin galena. I have specimens from Naica that have near identical galena in combination with fluorite and chalcopyrite, so Naica is also a likely locality as well
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Ricardo Melendez




Joined: 21 Apr 2014
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Location: Estado de Mexico


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PostPosted: Feb 16, 2017 13:38    Post subject: Re: What is it?  

I just saw some photos of galena twins, so I agree.

Many thanks you Experts.
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