Can anyone explain to me what these egg-like rocks are? I am stumped.

I hope someone can enlighten me as to what these rocks are.
They all have rounded bottoms and the top view almost looks like a fossilized egg broken in half.

Your terrible cooking. Nice try. (Y)

Originally posted by pandapowerjamie
Your terrible cooking. Nice try. (Y)

WTF do you mean? I am serious in my question and you offered no help at all.

Nice try??? Are you kidding me?
Jesus I already remember why I stopped coming to ATS.

Do you have more of them? I'm wondering what the inside looks like, if you split one in half, would it be like a geode, full of crystal?

I don't know how geodes look when they're first found, but your rocks make me curious.

That last part of that sentence sounds kind of weird



They are very cool looking though, I've never seen anything like them.

looks a lot like these stalagmites in the link above

They look like petrified eggs. I would take to a local lab that tests such things to have it analyzed. Where did you find them?

reply to post by snowspirit


Thanks for a real response.

I have found geodes in the past but they are very different from these rocks.

I only have found these 3, but I don't think I will try to break them--they seem pretty solid through and through....

As to where I found them -- on different hikes in south-eastern Missouri.

reply to post by Chamberf=6


They look to be what is called a concretion. Its where mud has kind of formed around something then through time has turned to rock. I have seen others that have really wierd shapes. Where did you find them?

Not sure what they are.

I have a suggestion: if you want to findout if a rock is hollow or not drag a small chain over it - the noise made will change in pitch when the chain goes over a hollow spot. This is the old-fashioned way of determining if a concrete deck is delaminated - filled with hollow spots.

reply to post by mydarkpassenger


Well using the method you mentioned made me believe that they are not hollow. Their weight is pretty hefty, seeing as how they are not that big.
I found the largest one in a conservation area outside of St. Louis. The other two were more in the SE Missouri area known for its hills and karst topography...

Anybody know their geology? I took one class in geology, but it was several years ago by now.

reply to post by iforget


They do resemble each other. Only thing is they were found on ridges and not in caves, so I am still scratching my head...

Serious man just do a google image search for concretion. What you have is the first picture.

reply to post by Quantazero


Agreeing with the concretion theory.
Looks like conditions may have changed as the deposits were forming around the central object.

Like mentioned, Google concretion images. You'll see many like yours.