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Black tourmaline in a fan shape
  
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cakattack




Joined: 09 Nov 2018
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PostPosted: Nov 10, 2018 11:54    Post subject: Black tourmaline in a fan shape  

HI! I'm new. I recently went to a local Rock Club's silent auction and won this little number. It was listed as tourmaline var. schorl and the locality given was Pyong gang-gun Kangwon-do, South Korea.

The thing is, I cannot find another image anywhere of black tourmaline that is in this fan shape. This is where I was hoping y'all expertise could help me out. Have you seen tourmaline form like this? Could it be Kyanite? (It is pretty hard and totally solid)

I appreciate any input you might have, thanks!



IMG_4231.jpg
 Mineral: Schorl
 Locality:
Pyonggang-gun, Kangwon Province, North Korea
 Dimensions: 6.35 x 5 x 3cm
 Description:
 Viewed:  781 Time(s)

IMG_4231.jpg


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John Betts




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PostPosted: Nov 10, 2018 12:14    Post subject: Re: Black tourmaline in a fan shape  

Is there a reason to doubt the label that accompanies the specimen?

That is an old specimen, probably found in the 1960s or 1970s. It predates the Internet by 25 years. As a result Internet references are going to be no use.

Your best bet will be to reach out to geologists or mineral clubs in S. Korea or find a library with Journal of the Mineral Society of Korea.

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Mathias




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PostPosted: Nov 10, 2018 12:16    Post subject: Re: Black tourmaline in a fan shape  

Looks like black Kyanite.
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cakattack




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PostPosted: Nov 10, 2018 12:27    Post subject: Re: Black tourmaline in a fan shape  

I suppose I don't really have a reason to doubt the tag. I just hadn't seen anything like it before and thought I would investigate a little.
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cakattack




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PostPosted: Nov 10, 2018 12:33    Post subject: Re: Black tourmaline in a fan shape  

Mathias wrote:
Looks like black Kyanite.


I thought so too. All the other rough kyanite I have is easy to break/peel off, are there varieties that are less fragile?

PS - I am 100% an amateur compared to the knowledge I've seen so far on this board, so hopefully I am not offensively undereducated from a gem and mineral standpoint :).
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Mathias




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PostPosted: Nov 10, 2018 12:37    Post subject: Re: Black tourmaline in a fan shape  

I could easily find a similar specimen on mindat.
Indeed Schorl from North Korea.
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cakattack




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PostPosted: Nov 10, 2018 12:42    Post subject: Re: Black tourmaline in a fan shape  

Mathias wrote:
I could easily find a similar specimen on mindat.
Indeed Schorl from North Korea.


Oh geez, I didn't even know about minedat. Shows off my extensive knowledge of internet searching capabilities.

Thanks. I guess he just had his Koreas mixed up.

Case closed.
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Mathias




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PostPosted: Nov 10, 2018 12:48    Post subject: Re: Black tourmaline in a fan shape  

Mindat. Not Minedat.
Google mindat north korea
Once you are on the mindat north korea page click on photos.
Then click on mineral photos.
You’ll find a similar specimen on page 3.
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Josele




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PostPosted: Nov 10, 2018 13:03    Post subject: Re: Black tourmaline in a fan shape  

Here is the link:
Schorl from North Korea
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Riccardo Modanesi




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PostPosted: Nov 11, 2018 05:39    Post subject: Re: Black tourmaline in a fan shape  

Hi to everybody! Other possibilities: actinolite, hornblende, or diopside. I found some in the Alps as well..
Greetings from Italy by Riccardo.

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Hi! I'm a collector of minerals since 1973 and a gemmologist. On Summer I always visit mines and quarries all over Europe looking for minerals! Ok, there is time to tell you much much more! Greetings from Italy by Riccardo.
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jorge santos garcia




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PostPosted: Nov 12, 2018 04:28    Post subject: Re: Black tourmaline in a fan shape  

I have tourmalines from Portugal and Mozambqiue with that fan shape - acicular crystals growing/stacked together. No photos to put in here but you can see 2 or 3 examples if you look the Mozambican tourmalines' page on Mindat.

Jorge
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Peter Lemkin




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PostPosted: Nov 12, 2018 05:00    Post subject: Re: Black tourmaline in a fan shape  

In the Czech Republic there are acicular tourmaline bundles that look just like that. The ones I have are parallel, not in a fan shape, but see no big difference if it is radiating or parallel growth in this case. In both, the individual tourmaline xx's are long, thin and of the same size, side-by-side.
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alfredo
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PostPosted: Nov 12, 2018 16:58    Post subject: Re: Black tourmaline in a fan shape  

As Jorge and Peter pointed out, there are other localities for fan-shaped aggregates of black tourmaline, many such localities in fact. I've seen similar ones from Mexico, Chile, Bolivia, Japan too, and I'm sure there are plenty more I don't know about, so no need to worry about the label being wrong.
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cakattack




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PostPosted: Nov 12, 2018 18:07    Post subject: Re: Black tourmaline in a fan shape  

Thank you guys. Mindat is awesome. All of your insight has really helped. I think I will just go with the info on the card, changing South to North Korea. Certainly, I now know much more about black tourmaline than I did a few days ago.
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