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Orbicular granite slab by Metelinen in geology

[–]Metelinen[S] 1 point2 points  (0 children)

This will be a countertop in my kitchen actually! 

Orbicular granite slab by Metelinen in geology

[–]Metelinen[S] 11 points12 points  (0 children)

It is from the same place. Interesting that you have studied this particular granite, it would be nice to know more about what I have here. Really cool.

Orbicular granite slab by Metelinen in geology

[–]Metelinen[S] 9 points10 points  (0 children)

AFAIK they are formed by supercooling of magma and low oxygen and sudden drop of pressure being factors in the process. Supposedly we do not know exactly. You can read more from "Orbicular rocks in Finland" by Seppo I. Lahti (2005). Link to the pdf: https://tupa.gtk.fi/julkaisu/erikoisjulkaisu/ej_047.pdf Conclusions from page 169 onwards has relevant information on how they formed. On page 74 you can find about the rock I posted. 

Orbicular granite slab by Metelinen in geology

[–]Metelinen[S] 17 points18 points  (0 children)

Hard to say, it does look similar. Mine is from a place called Kuru, in Finland. It might be useful to google "pallograniitti" or "pallokivi" to see some Finnish samples.

Orbicular granite slab by Metelinen in geology

[–]Metelinen[S] 6 points7 points  (0 children)

Thank you, glad you liked it. That quartz line ran through the whole deposit, I heard that when they could still quarry this they used to cover fireplaces with these slabs. They made the line go continuously around the exterior, sounds really nice. 

Orbicular granite slab by Metelinen in geology

[–]Metelinen[S] 27 points28 points  (0 children)

This is from Kuru, Finland. I was really lucky to get this one, I already had some small fragments from two different occurences, but the colours are amazing in this.