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Help about this rock
  
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miqui2077




Joined: 06 Apr 2021
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Location: friuli

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PostPosted: Apr 06, 2021 16:41    Post subject: Help about this rock  

I found this rock in my garden (Friuli Venezia Giulia, Italy)

It seems to be a volcanic rock but here we don't have volcanoes.

0.170 litres, 270g.

It's a porous stone, the shape reminds me of an egg (half egg). It's light blue (flash of the smartphone does not reproduce real colors)



IMG_20210405_142719_033_littlelittle.jpg
 Description:
Udine
7cm
 Viewed:  340 Time(s)

IMG_20210405_142719_033_littlelittle.jpg



IMG_20210405_142749_003_littelittle.jpg
 Description:
Udine
7cm
 Viewed:  344 Time(s)

IMG_20210405_142749_003_littelittle.jpg


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SteveB




Joined: 12 Oct 2015
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Location: Canberra

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PostPosted: Apr 06, 2021 17:20    Post subject: Re: help about this rock  

A type of rhyolite maybe?Porphyritic? Italy has LOTS of volcanoes btw. Maybe little are active or dormant now but historically a lot of volcanic activity and many many many volcanic rocks in the region. Oddly its pinker “ball” inclusions remind me of a type of bauxite, Any chance you have bauxite mining in the area? Sorry I can’t offer more but volcanic origin is my gut still.
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Volkmar Stingl




Joined: 23 Sep 2012
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PostPosted: Apr 06, 2021 21:45    Post subject: Re: help about this rock  

Hello!

For me this is a water-worn and well rounded (but broken) piece of slag. The glassy surface and lots of bubbles indicate this piece as man-made.

An additional picture of the broken side would help.

Volkmar
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miqui2077




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PostPosted: Apr 07, 2021 01:01    Post subject: Re: help about this rock  

This picture shows the broken part, and shows also the true colors of the stone.


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miqui2077




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PostPosted: Apr 07, 2021 01:09    Post subject: Re: help about this rock  

SteveB wrote:
A type of rhyolite maybe?Porphyritic? Italy has LOTS of volcanoes btw. Maybe little are active or dormant now but historically a lot of volcanic activity and many many many volcanic rocks in the region. Oddly its pinker “ball” inclusions remind me of a type of bauxite, Any chance you have bauxite mining in the area? Sorry I can’t offer more but volcanic origin is my gut still.



We don't have bauxite here, yes from the picture it remembers that type of stone but it's caused by the flash. I will take other pictures. You can view the broken part with its true colors.

Another think that it doesn't sound with a metal dector so it doesn't contain metals.
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Volkmar Stingl




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PostPosted: Apr 07, 2021 02:13    Post subject: Re: help about this rock  

Definitely slag.
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miqui2077




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PostPosted: Apr 07, 2021 03:28    Post subject: Re: help about this rock  

Volkmar Stingl wrote:
Definitely slag.


Thank you!
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Sante Celiberti




Joined: 04 Oct 2019
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Location: Tuscany


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PostPosted: Apr 07, 2021 04:40    Post subject: Re: Help about this rock  

Perhaps a Euganean vacuolar trachyte with celadonite from the relatively nearby Zovon (Padua province, Veneto, Italy), which came by chance in your garden.
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