Yep, but, just a geology thing.
A member of the rock forum ID'd it as Ohio Flint (from Ohio, USA), and I totally agree.
The patterning combined with those ugly splotches and creases in the stone are the giveaway.
Photo #438
These are 'Brazilian Agate Nodules' that I tumbled. Impossibly pitted.
Agates are supposed to have banding, and these don't...so I guess that makes them Brazilian Chalcedony instead of Brazilian Agate.
This 66% Het Clown/50% Het Lavender Albino ball python was also 100% dedicated to biting me.
I had to put one of the stones on his tail for the photo to keep him from closing the distance between us.