Fossil colony or mineral impurity?

[himmelangst]

I found a shale exposure with of big concentrations of these reddish lumpy nodules. They retain a spherical shape when you split the shale horizontally. The material is more difficult to split and noticeably heavier than the slate but not magnetic. The granules range in size from a pinpoint to huge “colonies” along the outcrop.. Thanks for your help! 

 

Edited Tuesday at 03:15 AM by himmelangst
Poor wording

[FranzBernhard]

Some sort of mineral formation. In the concretionary/diagenetic line. Possibly iron-rich mineral.

Don´t think its metamorphic.

Franz Bernhard

Edited Tuesday at 05:39 AM by FranzBernhard

[Ludwigia]

My first thought was extremely weathered garnet, but I'm not at all sure about that.

[Coco]

I was also thinking of garnet.

 

Coco

[Fossildude19]

Mineral inclusion, of some sort.

[FranzBernhard]

We got some agreement: Not fossils .

Franz Bernhard

[ynot]

I also had the thought of them being low grade garnet, but after looking at the close ups I think they are limonite replacement of iron pyrite.

Edited Tuesday at 02:30 PM by ynot