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Blue herderites? from Badakhshan Afghanistan?
  
  Index -> Incorrect classification and fakes
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Christophe Gobin




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PostPosted: Mar 16, 2022 09:45    Post subject: Blue herderites? from Badakhshan Afghanistan?  

Hello everyone,
The last weeks I have been offered through the social medias, some mineral specimens in Pakistan, as allegedly new blue herderites from Badakhshan in Afghanistan. I bought a few of them and sent them to the lab for analysis. They are actually celestines. The Pakistani dealer told me that he sold also to a US dealer so be careful if you are offered some of them. Run some analyzes because it will be probably celestines and it is not at all the same value.
The Pakistani dealer very active in the social medias is well-known through facebook.
He is selling a lot of specimens from Pakistan/Afghanistan. And he just dispute the analyses from the Museum…. I am running some extra analysis in a second lab just as a proof even if I know the final result. He is supposed to wait on his side some analyzes from this US dealer. If and when I have them, I will publish them too, whatever the result.
I would be more than happy if it was confirmed to be herderites because it would be worldclass specimens but I don’t dream.

I am not posting this to spread bad words but it is my responsibility to warn the mineralogical community to be careful. If, of course, other analyzes show that the 1st test was wrong, I will update this publication. But again it would be a really good surprise.
Here are the lab results from Cristiano Ferraris and Giancarlo Parodi from the National Museum of Natural History in Paris.



Expertise Mr. C. Gobin - MNHN Ferraris_page2.jpg
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Expertise Mr. C. Gobin - MNHN Ferraris_page2.jpg



Expertise Mr. C. Gobin - MNHN Ferraris_page1.jpg
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Expertise Mr. C. Gobin - MNHN Ferraris_page1.jpg



photo 1.jpeg
 Description:
Here is one of the best ..... celestines
 Viewed:  2131 Time(s)

photo 1.jpeg



photo 2.jpeg
 Description:
back view, same piece
 Viewed:  2131 Time(s)

photo 2.jpeg


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Christophe Gobin




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PostPosted: Mar 16, 2022 11:44    Post subject: Re: Blue herderites? from Badakhshan Afghanistan?  

About the coloring mechanisms in celestine:

http://www.minsocam.org/msa/collectors_corner/arc/celestite.htm
(link normalized by FMF)
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Pete Richards
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PostPosted: Mar 16, 2022 11:56    Post subject: Re: Blue herderites? from Badakhshan Afghanistan?  

There's a tremendous difference between the colors in the photos and the colors in the specimens shown with the spectrum! The colors in the photos are so strongly blue and yellow as to look unreal. The crystals certainly look like celestine, however.
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Collecting and studying crystals with interesting habits, twinning, and epitaxy
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James Catmur
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PostPosted: Mar 16, 2022 13:12    Post subject: Re: Blue herderites? from Badakhshan Afghanistan?  

Look like Celestine to me too

Pete Richards wrote:
There's a tremendous difference between the colors in the photos and the colors in the specimens shown with the spectrum! The colors in the photos are so strongly blue and yellow as to look unreal. The crystals certainly look like celestine, however.
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Christophe Gobin




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PostPosted: Mar 25, 2022 00:19    Post subject: Re: Blue herderites? from Badakhshan Afghanistan?  

Just received the identification of the second sample from Federico Pezzotta, Mineralogy Curator at Museo di Storia Naturale of Milano.
Of course confirmed too as celestine.

For my part, an arrangement could be found with the Pakistani dealer. Maybe this second analysis will allow him to find reason and accept that it is celestine.



20220325 Celestite CG F Pezzotta.jpg
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20220325 Celestite CG F Pezzotta.jpg


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