gold looking rock with kind of rusty looking dirt inside?

[Nikolajdk]

Hej hej!

last weekend when i was in denmark for a vist i found a strange rock... i have no ideas what it is, so i was hoping some genius could help me out here? i found it in a place called Stevns, by the shore near a limestone quarry. would be great if someone can point it out.


//Nikolaj

 

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[Eu_citzen]

limonite concretion, probably.

 

[mamabear]

so the edge is pyrite type material? that is a weird one.
You are so lucky to be over there experiencing so many countries.

 

[Wild Boulder Bill]

The minute you say rust you think iron. And that looks to be iron pyrite as far as I can tell from the picture. And looking from the picture I would be looking for oh gold, silver, tetrahedrate, copper and a host of other associated minerals.

 

[Eu_citzen]

so the edge is pyrite type material? that is a weird one.
You are so lucky to be over there experiencing so many countries.

If I were to build further on my theory of limonite concretion the "outer walls" could be marcasite, a low temperature variation of Pyrite. "Common" in sedimentary rocks.