Any idea what is this?

[hidden]

Hello everyone! I was trying to identify a stone/rock/something and found this forum - I hope that someone can help me.

My dad was doing some construction works and when digging deep in the ground, he found that stone. My mom supposes that it has a shape of leaf imprinted on the front. We've been trying to find out what it is for so long and never found a matching photo.

 

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[bologna321]

Obsidian with some olivine inclusions?

 

[dansalata]

yes looks like obsidian to me also

 

[stdenis_jd]

where was it found? Country, state, etc. Not necessarily the address or anything :-)

I don't believe olivine will be found in obsidian - felsic lava (obsidian, rhyolite, etc.) vs. mafic lava (olivine, basalt, gabbro, etc.). Olivine is in mafic/ultramafic rocks

 

[hidden]

Thank you all for your prompt answers! After browsing some photos I would say it looks like obsidian. It was found in north of Poland.



And some more photos of these yellow fragments.

 

[DDancer]

I'll say obsidian to. Its not unusual to have some coloration in the flakes and fractures where light can pass thru easily.

 

[vpnavy]

Hello everyone!...

I noticed this was your very first post - so, Welcome Aboard.

 

[Eu_citzen]

Slag.