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Please help identify : BLACK glass like stone with tiny pink „crystals”???
  
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oliviawilk




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PostPosted: May 26, 2019 16:17    Post subject: Please help identify : BLACK glass like stone with tiny pink „crystals”???  

Hello,

Yesterday my son found it on a wild beach in northern Spain in Galicia / A Coruña.. asked me to help him identify it but I have completely zero knowledge.

Looks like a slab of black glass but it’s thick and no transparent at all , only 1mm where is really thin it’s translucent in brown/yellow color.

But still I would say it’s glass if not pink crystal looking something on it.

Weighs 165grams.

Thank you so much for helping me !



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oliviawilk




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PostPosted: May 26, 2019 16:21    Post subject: Re: Please help identify : BLACK glass like stone with tiny pink „crystals”???  

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oliviawilk




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PostPosted: May 26, 2019 16:22    Post subject: Re: Please help identify : BLACK glass like stone with tiny pink „crystals”???  

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oliviawilk




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PostPosted: May 26, 2019 16:23    Post subject: Re: Please help identify : BLACK glass like stone with tiny pink „crystals”???  

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oliviawilk




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PostPosted: May 26, 2019 16:24    Post subject: Re: Please help identify : BLACK glass like stone with tiny pink „crystals”???  

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Josele




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PostPosted: May 26, 2019 16:48    Post subject: Re: Please help identify : BLACK glass like stone with tiny pink „crystals”???  

Hello Olivia, welcome to FMF.
Enlarged photos show what seem to be small bubbles. If so, I think it could be a slag glass.
A nice find anyway.
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Kevin Schofield




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PostPosted: May 27, 2019 08:44    Post subject: Re: Please help identify : BLACK glass like stone with tiny pink „crystals”???  

oliviawilk wrote:
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Hi Olivia,

if this were a "real" rock, it would be an obsidian, which is a very hard glassy form of acid volcanic rock...a form of quickly-cooled lava. The "conchoidal" (shell-like) fractures are very characteristic of this rock. The pink crystals would have to be material picked up from the rock that the lava passed through on its way to the surface...I have seen volcanic tuffs in the Cabo de Gata in southern Spain with garnets in them.

HOWEVER (there is always a but!)...although Galicia has a lot of intrusive acid rocks (granites), I can find no record of volcanic rocks associated with them. That, plus the tiny bubbles and the fact that the piece is flat on both sides (which is quite unusual for a non-bedded rock) suggests to me that Josele's conclusion is correct, and this is some form of man-made glass.

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