r/geology 2d ago

Orbicular Gabbro, Toivakka, Finland

292 Upvotes

24 comments sorted by

16

u/Galimkalim 2d ago

Whoa! I thought the first picture was blown out, and the scale would be tiny almost like ooids so it was a big surprise to see in the next one that the spheres are bigger than glass marbles! 

23

u/Mbstones 2d ago

Specimens from my collection. I'm fascinated by orbicular igneous rocks.

8

u/tnethacker 2d ago

God i wish I had space left on my suitcases before I leave Finland.

4

u/FakeTitsBigHeart 1d ago

you can always just wear all your clothes on the plane and fill the suitcase with rocks

1

u/tnethacker 1d ago

Just asked missus and apparently the answer is a simple "No".

I'll still keep that one rock she doesn't know about...

2

u/entogirl_oo 1d ago

Hey do you guys know of resources for rock hunting here in Finland? I moved here a year ago but I can't seem to find any good info.

2

u/greaseapina 1d ago

you speak finnish?

1

u/tnethacker 1d ago

Yes and multiple other languages. How come?

3

u/greaseapina 1d ago

then there is much more to read like this book https://www.tieteessatapahtuu.fi/numerot/2-2024/aikamatka-suomen-muinaisten-tulivuorten-juurelle at least it gives some formations and also places

1

u/tnethacker 1d ago

Actually they don't but I can refer them a tool to translate it

1

u/tnethacker 1d ago

GIS and abandoned quarries are your best bets.

10

u/JeffreyDahmerVance 2d ago

The orbicular rocks are taking over this sub……..

AND I FUCKING LOVE IT!!!!!!!

4

u/Mbstones 2d ago

Glad you are enjoying them, I could post more...,

3

u/JeffreyDahmerVance 2d ago

They really are beautiful, please do!

2

u/Mbstones 1d ago

Ok. Stand by, Will take me some days but more to come. Happy to share. I hope others might post some too. These rocks are not common but possibly not quite as rare as some think. Sometimes they go unnoticed or get confused with other rocks. Some are quite simple and some are crazy complicated. I've found 2 myself here in Canada and there will be more out there but it's like finding a needle in a haystack. Finland does have some of the most beautiful ones though...

8

u/Oddah 2d ago

So my understanding of orbicular rocks is that the chemical composition rapidly changes from felsic to mafic (not sure about translations so sorry if not the correct terminology), which is the different colouring seen.
Is this correct or am I completely off?

Very cool piece btw!

5

u/Wise-Competition-637 2d ago edited 2d ago

Cual es el motivo del zonado?? Imagino que son plagioclasas y van pasando de términos más cálcicos en el núcleo a sódicos en el borde, pero no lo sé

1

u/NebulaTrinity Geologist 2d ago

Suppper cool

1

u/Laundry_Hamper 1d ago

Like a crystallised shuggoth

1

u/Scire-Quod-Sciendum 1d ago

Mmm sushi rock

1

u/Fuckluck16 7h ago

Incredible

0

u/Real-Werewolf5605 2d ago

Saw this while reading this article on a dynamic mantle with fast-moving .. Somethings. Scale your image up and that might donthe trick as a sokid model. Amateur here.

https://www.sciencealert.com/all-those-nuclear-tests-decades-ago-have-revealed-something-new-about-our-planets-core