What is this?:rolleyes:

[baskja]

Hi guys,

can you please help me what kind of mineral is this?

Thanks.

Barbora

 

[Champ Ferguson]

While internet id is iffy at best, it is all but impossible without provenance. ANYthing you can tell us about it may help.

 

[baskja]

I am working as an assistant of portal manager in Slovakia - Tunnel Višňové - Dubná Skala (Middle Europe - Slovakia - Vrútky/Martin).
I did find it during the excavation of front. The main rock is biotic granodiorite of high strenght.
There are now few groundwater inflows.

B.

 

[Dave J.]

That's a tough one.
Isn't quartz.
To me, doesn't look like either calcite or gypsum, but I could be mistaken.

That, and the fact it's coming from a mine, suggests it's a heavy metal mineral of some kind. If you know what was mined there, that'd be a clue.

 

[Champ Ferguson]

Take it to your local University Geology department. They'll be happy to help you. That's almost always your best bet for a good id.

 

[Johnho]

Like was said, hard to do with what you are showing but those flat plated crystals look like barite.

 

[Dave J.]

Like was said, hard to do with what you are showing but those flat plated crystals look like barite.

Think ya nailed it, Johnho.
http://www.mcdougallminerals.com/blog/tag/barite-crystal/
https://www.washingtonminerals.com/mineral.php?mineral=barite-spruce-ridge.htm

https://en.wikipedia.org/wiki/Baryte
http://www.minerals.net/mineral/barite.aspx

Barite is heavy stuff. If just by picking it up it feels unusually heavy, that will help confirm the diagnosis.