Any help identifying this rock.

[LookingAtRocks]

Hi folks, this is my first post (and its from my phone) so apologies if it doesn't work.

I found this rock in a piece of shale the other day and was wondering if anyone knows what it is.

It is quite heavy for its size, it weighs 500 grams.

Any info would be great thanks in advance.

 

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[Whiplash00]

Is it magnetic? You broke it open right?

 

[Mrdigz]

Can you post a couple more pics of all angles and some close ups.

 

[Eu_citzen]

Looks like basalt with something interesting in the middle. Sulphides (silvery) and then something I'm not certain on.

 

[Whiplash00]

Looks like basalt with something interesting in the middle. Sulphides (silvery) and then something I'm not certain on.

Agreed

 

[LookingAtRocks]

Is it magnetic? You broke it open right?

Sorry about the lengthy delay.

Yeah, I cracked it open and it is not magnetic.

 

[LookingAtRocks]

Somebody told me the inside could be "Granular Pyrite" what do you guys think?

 

[LookingAtRocks]

These are the best pictures I could get.

 

[Brian T. Booth]

Iron concretion. Possibly siderite. FeCO3. Found in shale and very dense. That "something interesting in the middle" is a fossil or something that was in the water when deposition was taking place. If it were basalt you would have some kind of deformed contact boundary with the shale. Unless you are saying that the basaltic rock was placed in the shale after being formed which seems highly unlikely because the basalt would degrade in a weathering environment quite fast.