🔎 UNIDENTIFIED Help to ID rock

[mulecrick]

I'm hoping to find some answers here about these rocks I have. I believe they are concretion rock and if so can someone tell me about them and if they are worth any value or keeping them.

The one is the size of a volleyball and one is bigger than a volleyball but more oblong and not as round. They are very very heavy.

 

[Robot]

Hi mulecrick,​

There are soo many here on Treasure Net more capable than me as Geologists, this being said, what I believe you have is a Geode!

How will you know?
"Crack the Egg"

How to Tell if a Rock is a Geode: A Step-by-Step Guide

Geodes are one of the coolest things that anyone can find in nature. Every rockhound I know loves to look at them and peer inside at the crystals. They are pretty much an essential part of any aspiring geologist’s rock and mineral collection. The problem is that if you find a potential geode in...

rockhoundresource.com

 

[galenrog]

Either a geode or a concretion, based on the images. If sandstone or limestone, definitely a concretion.

In central Texas most nodules of that color and shape are limestone. Some carry fossils, most do not.

I have found fossil bearing sandstone concretion on the Oregon coast with similar color, shape, and visible texture.

Also in Oregon, but also Idaho and Nevada, I have dug thousands of geodes from a few hundred locations, but none I remember have the same surface texture.

All this leans me in the direction of concretion, not geode.

Just my experience and opinion.

Time for more coffee.

 

[mulecrick]

Thanks for your response. We have both limestone and sandstone. It sure would be interesting if there was a fossil at the core.
I really don't want to try to crack one open to find out. I have lived here all my live and I have never seen anything like it. I hike and I'm in the outdoors and in the back country almost every day.

I'm hoping for some more info from you experts.

Thank You.

 

[opalboy]

I think it’s sandstone concretion, the red in the last photo is probably iron, making the sandstone harder. A search found quite a few similar balls of all sizes.

 

[mulecrick]

I think it’s sandstone concretion, the red in the last photo is probably iron, making the sandstone harder. A search found quite a few similar balls of all sizes.

I believe you are right. Thanks

I'm hoping to see if anyone has any experience with sandstone concretions and what they may think about having a fossil.