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Question about Sphalerite from Spain?
  
  Index -> What is it? - Where is it from?
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Gagat Minerals




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PostPosted: Nov 08, 2017 18:47    Post subject: Question about Sphalerite from Spain?  

Hi everybody - my name is Kristof, I would like to ask you about this mineral specimen, unfortunately without any details on label except 'Sphalerite - Spain'. What do you think - could it be from the Troya Mine in Basque Country, or rather this is a mistake and this is Elmwood, TN? Pictures as attachment.
Regards



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Bob Carnein




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PostPosted: Nov 08, 2017 20:49    Post subject: Re: question about Sphalerite from Spain  

That's a tough question, because there are so many sphalerite localities. However, the matrix on this piece doesn't look to me like any I've seen from Elmwood. But, I am no expert on Elmwood??
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GneissWare




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PostPosted: Nov 08, 2017 20:54    Post subject: Re: question about Sphalerite from Spain  

I don't see any matrix. Elwood matrix is a distinctive, fine-grained tannish material.
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Bob Harman




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PostPosted: Nov 08, 2017 22:04    Post subject: Re: question about Sphalerite from Spain  

The specimen is ALL sphalerite.....ruby jack as ore. Could be from any of several US sites including the Southern Illinois fluorite district. Not familiar with European and Asian sites. BOB
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Peter Lemkin




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PostPosted: Nov 09, 2017 00:10    Post subject: Re: question about Sphalerite from Spain  

I don't think anyone could give a definitive guesstimation of the locality. I have some sphalerite from Santander Spain that is of the same general color [best I can see the color]. Santander is well known for quite clear dark bi-color sphalerite, but not all of it is, and I'd imagine even in Spain there are several locations for sphalerite...so don't know if my statement is any help. Use mindat website and see if you see any spanish sphalerite that looks similar, but I think you can never be 100% sure with a label like that. Much sphalerite looks something like that. A few locations are distinctive due to color, habit or matrix.
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marco campos-venuti




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PostPosted: Nov 09, 2017 04:03    Post subject: Re: question about Sphalerite from Spain  

Doesn't looks Spanish. Small and numerous crystals, very dark and slightly elongated shape.
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Tobi




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PostPosted: Nov 09, 2017 04:09    Post subject: Re: question about Sphalerite from Spain  

Gagat Minerals wrote:
Hi everybody - my name is Kristof, I would like to ask You about mineral specimen, unfortunately without any details on label except 'Sphalerite - Spain'. What do you thing about - could it be Troya Mine from Basque Country or rather this is mistake and this is Elmwood, TN? Pictures as attachment.
Hi Kristof, I'm no expert on Spanish sphalerite localities, but I'm quite experienced in U.S. minerals and this specimen looks to me like a typical no-matrix piece of sphalerite from Elmwood Mine ...
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geoalfon




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PostPosted: Nov 09, 2017 04:15    Post subject: Re: question about Sphalerite from Spain  

Hi, I am sure around 100% that this sphalerite is not from Spain. It seems from Elmwood Mine, USA.
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Alfonso
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James
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PostPosted: Nov 09, 2017 06:36    Post subject: Re: question about Sphalerite from Spain  

I agree, not Spanish

geoalfon wrote:
Hi, I am sure around 100% that this sphalerite is not from Spain. It seems from Elmwood Mine, USA.
Best regards
Alfonso
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lluis




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PostPosted: Nov 09, 2017 16:45    Post subject: Re: question about Sphalerite from Spain  

Dear all

Yes, agreed with all that say that does not seems spanish item...
I have not seen any spaniard sphalerite like this.
Although I have also not seen any Elmwood one like this....

Could not be an error and label just not the correct one?
For that, I have seen this in NY Museum.... (simply labels and specimens interchanged...)

With best wishes

Lluís
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Jordi Fabre
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PostPosted: Nov 09, 2017 18:08    Post subject: Re: Question about Sphalerite from Spain?  

Not Spanish. It looks like from Elmwood.
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Tobi




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PostPosted: Nov 10, 2017 04:05    Post subject: Re: Question about Sphalerite from Spain?  

Hi Kristof,

of course it's always more or less vague to "guess" a locality. In some cases you will never have an idea where a specimen comes from, in other cases the origin can be determined reliably (e.g. pyrite from Navajun/Spain). In your case you see that many here are quite sure that this specimen comes from Elmwood Mine, Tennessee, you already guessed that in your opening post. And though some others in this discussion argued that they have never seen similar specimens from Elmwood, I disagree: I handled a lot of sphalerite specimens from Elmwood Mine and your sphalerite looks like a typical one. The form, colour and luster of the crystals and the way the cleavage at the bottom looks - all this makes it a distinctive Elmwood sphalerite. Yes, it COULD be from another locality and nobody can say for a 100% that it definitely IS from Elmwood. But I'm sure for a 97 % ;-)

For comparison, here's the Elmwood sphalerite from my collection, a "ball" of sphalerite on matrix; the "crystal ball" looks exactly like your piece. And i also had and have Elmwood specimens with sphalerite as matrix or as associated mineral, and in many cases it looked like yours. So, although we will never know absolutely sure if Elmwood or not, please don't get insecure about the opinions that the specimen does not look like Elmwood - it does ;-)



ElmwZINK.JPG
 Mineral: Sphalerite
 Locality:
Elmwood Mine, Carthage, Central Tennessee Ba-F-Pb-Zn District, Smith County, Tennessee, USA
 Dimensions: Specimen size 12 cm, sphalerite "ball" 4 cm
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