[Hydrae]

Originally Posted by Otter

My kind of news day:

"Geologist Finds Rare Formation Inside Rock That Looks Exactly Like Cookie Monster on Sesame Street" pic.twitter.com/rKftbLw804

— Dr. Jacqueline Antonovich (@jackiantonovich) January 23, 2021

You can see the holes they drilled into the one to make the eyeball. I suspect the same is true for the other one as well.

I have seen (and own) quite a few geodes (and thundereggs if you are familiar with those) and have never seen one with a hole to the outside. If it had a hole then the inside would not have formed.