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Problem with identification
  
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mineralowitz




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PostPosted: Mar 28, 2023 09:04    Post subject: Problem with identification  

I wonder what it could be, but I have no idea.
The crystal is found in gneiss from Sweden.



identification_1.JPG
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identification_1.JPG



identification_2.JPG
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James Catmur
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PostPosted: Mar 28, 2023 10:35    Post subject: Re: Problem with identification  

Do you know where it came from? That might help
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mineralowitz




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PostPosted: Mar 28, 2023 11:06    Post subject: Re: Problem with identification  

It is sample from glacial erratic from Scandinavia found in northern Poland.
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Vinoterapia




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PostPosted: Mar 28, 2023 11:27    Post subject: Re: Problem with identification  

My guess go for a Zircon crystal.
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Roger Warin




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PostPosted: Mar 28, 2023 13:26    Post subject: Re: Problem with identification  

I think the same.
Zircon crystals, in the form of grains included in more recent rocks, are the oldest known terrestrial mineral witnesses. The oldest date back to 4.3 or 4.4 Ga, or 150 Ma after the formation of the planet.
The inclusion seems to be tetragonal - ditetragonal dipyramidal.
Nice find.
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mineralowitz




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PostPosted: Mar 29, 2023 01:27    Post subject: Re: Problem with identification  

Thanks for your replies. Such zircons are also found in this rock. Because they are anhedral (and that crystal in the previous micro photos is euhedral) I thought it might be something else. But on the hand, they have similar relief.


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Bob Carnein




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PostPosted: Mar 29, 2023 10:17    Post subject: Re: Problem with identification  

There appears to be a faint pleochroic halo around the crystal in your first photo. That also suggests zircon as a possibility.
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