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Galena, Kommern
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Mathias




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PostPosted: Apr 20, 2019 11:41    Post subject: Galena, Kommern  

A couple of months ago I purchased a small specimen of Galena, from a German Collector.

The label says:

"Galena, Kommern, Eifel. Mined 1956."

The size of the specimen (left to right); 7 cm.
Crystals are up to 6 mm.
The specimen has astonishing beauty (in my opinion).

Actually I have no reason to doubt the locality, but I can't find a single comparable specimen on any website (that doesn't automatically mean that the locality as specified on the label is incorrect).

Is there anybody out there who recognizes specimens like this one?


Thanks,

Mathias



077C.JPG
 Mineral: Galena
 Dimensions: 7 cm
 Description:
 Viewed:  1612 Time(s)

077C.JPG



077D.JPG
 Description:
 Viewed:  1586 Time(s)

077D.JPG



077P.JPG
 Description:
 Viewed:  1615 Time(s)

077P.JPG


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Susan Robinson




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PostPosted: Apr 20, 2019 11:45    Post subject: Re: Galena, Kommern  

The crystals on your specimen show "hopper growth" , which I've not seen in natural galena crystals. The hopper growth is caused by the edges of the crystals growing faster than the flat faces, and hence, you have the stepped features, much like the artificially grown bismuth crystals that have spectacular iridescence. I suspect that the matrix and crystals are either a lab product, or slag.
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alfredo
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PostPosted: Apr 20, 2019 11:50    Post subject: Re: Galena, Kommern  

https://www.mineralienatlas.de/lexikon/index.php/Deutschland/Nordrhein-Westfalen/K%C3%B6ln%2C%20Bezirk/Euskirchen%2C%20Kreis/Mechernich/Kommern

That's the locality on your label, but I don't know whether the galena really comes from there or not.
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Mathias




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PostPosted: Apr 20, 2019 12:07    Post subject: Re: Galena, Kommern  

Susan thanks,
Can Galena Crystals be grown in a lab?
Thanks
Mathias
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Pete Richards
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PostPosted: Apr 20, 2019 12:19    Post subject: Re: Galena, Kommern  

It might be time to ask how sure we are that these are galena....
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Collecting and studying crystals with interesting habits, twinning, and epitaxy
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Bob Harman




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PostPosted: Apr 20, 2019 12:24    Post subject: Re: Galena, Kommern  

Almost certainly lab grown bismuth.

Most examples are iridescent for effect, but some aren't. The non-iridescent examples may be to deceive, while the strongly iridescent examples are more as novelties.

Just googling "lab grown bismuth" brings up many photos of different examples. BOB
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John Betts




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PostPosted: Apr 20, 2019 12:54    Post subject: Re: Galena, Kommern  

Galena is well known in this habit (Bulgaria).

Let's not condemn these as synthetic bismuth without a simple hardness test.
Galena streak = Lead-grey
Bismuth streak = Silver-white

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John Betts




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PostPosted: Apr 20, 2019 13:00    Post subject: Re: Galena, Kommern  

"Kommen von" means "comes from" in German
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Mathias




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PostPosted: Apr 20, 2019 13:01    Post subject: Re: Galena, Kommern  

Thanks for your suggestion;
I think its easier to do elements analysis by XRF rather than streak test, to avoid damage.
Best regards
Mathias.
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John Betts




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PostPosted: Apr 20, 2019 13:07    Post subject: Re: Galena, Kommern  

Is the specimen heavy?
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Richard Arseneau




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PostPosted: Apr 20, 2019 13:10    Post subject: Re: Galena, Kommern  

Mathias wrote:
Thanks for your suggestion;
I think its easier to do elements analysis by XRF rather than streak test, to avoid damage.
Best regards
Mathias.


Please share the results when to have them. I am very curious to see what this turns out to be.
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Kevin Conroy




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PostPosted: Apr 20, 2019 14:01    Post subject: Re: Galena, Kommern  

For what it's worth, there's a similar looking specimen on Mindat: https://www.mindat.org/photo-69466.html

However, the collector who posted this is sometimes in error (as we all are). As has been suggested some tests on your specimen will be helpful.
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Tobi




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PostPosted: Apr 20, 2019 14:17    Post subject: Re: Galena, Kommern  

John Betts wrote:
"Kommen von" means "comes from" in German
That's right, but has nothing to do with the name of the locality which is "KommeRn", not "Kommen."
The only aesthetic and well-crystallized mineral from that locality is azurite.

I will not say that this definitely is not galena and/or that it is not from Kommern. BUT: I think I have some knowledge about German minerals and especially about galena which is one of my main collecting focuses. And I have never seen such a galena from any locality in Germany. To be honest, I only know such a prominent kind of "hopper" growth galena only from Madan, Bulgaria. And though I can't say WHAT exactly this is, I'm sure that it is NOT a galena specimen from anywhere in Germany, sorry :-(
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John Betts




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PostPosted: Apr 20, 2019 14:23    Post subject: Re: Galena, Kommern  

Galena from
Gottessegen open pit, Griesberg, Kommern, Mechernich, Eifel, North Rhine-Westphalia, Germany

References: Graf, HW., (1992): Fundstellen und Mineralien in de Nordeifel (Teil 1+2), MineralienWelt 1/1992, 3/1992

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Tobi




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PostPosted: Apr 20, 2019 14:28    Post subject: Re: Galena, Kommern  

I can't edit my post, so I have to write this addition in a new post. Concerning the skeletal crystals from Madan:
Tobi wrote:
To be honest, I only know such a prominent kind of "hopper" growth galena only from Madan, Bulgaria [...]
[...] To be honest, I only know such a prominent kind of "hopper" growth galena only from Madan, Bulgaria.
But even the ones from Madan are actually not that sharp-edged and regular, so I somehow doubt this is galena at all. If it is, you would maybe hold the best-crystallized natural "hopper" galena crystals of all times in your hands ...
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John Betts




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PostPosted: Apr 20, 2019 14:38    Post subject: Re: Galena, Kommern  

[quote="Kevin Conroy"]For what it's worth, there's a similar looking specimen on Mindat: https://www.mindat.org/photo-69466.html

I think the NY State collection was well curated and well documented, with many specimens from Kunz. Sounds legitimate.

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alfredo
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PostPosted: Apr 20, 2019 14:42    Post subject: Re: Galena, Kommern  

I've seen bismuth smelter products from Bolivia that look remarkably similar to this, so those who said bismuth rather than galena might be right.

Mathias, you should easily be able to do hardness and streak tests on the edge of the specimen without causing any visible damage.
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Deborah Deitsch-Perez




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PostPosted: Apr 20, 2019 14:46    Post subject: Re: Galena, Kommern  

Hi, Don't recall whether I have posted before; I have been lurking for a few years. I am a collector in Dallas Texas. I am going to post 2 pictures of a Peru Galena that we bought in Denver last year, that looks hoppered to me. If you saw the MAD case in Tucson this year, you saw it; I think it was in the front right. Thoughts?


IMG_0676.jpg
 Mineral: Galena on Pyrite
 Locality:
Huaron mining district, Huayllay District, Pasco Province, Pasco Department, Peru
 Dimensions: 3
 Description:
 Viewed:  1433 Time(s)

IMG_0676.jpg



IMG_0675.jpg
 Mineral: Galana
 Locality:
Huaron mining district, Huayllay District, Pasco Province, Pasco Department, Peru
 Dimensions: 1" x 1"
 Description:
close up of one
 Viewed:  1435 Time(s)

IMG_0675.jpg


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John Betts




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PostPosted: Apr 20, 2019 14:52    Post subject: Re: Galena, Kommern  

To see references for galena from Kommern search for "Bleiglanz von kommern" or "Galenit von kommern."

Many results are available.

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Mathias




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PostPosted: Apr 20, 2019 15:00    Post subject: Re: Galena, Kommern  

Streaktest.


20190420_215430.jpg
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20190420_215430.jpg


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