Looks like some kind of limestone nodule.
The inside seems to be made of of crinoids stems.
commons.wikimedia.org
commons.wikimedia.org
They fall apart into those little disks.
Looks like some kind of limestone nodule.
The inside seems to be made of of crinoids stems.
commons.wikimedia.org
commons.wikimedia.org
They fall apart into those little disks.
Thanks for the reply! Very nice pics, also. I forgot to mention in the post that the outside layer is agate. For a better description of the stuff on the inside, it’s a mass of little balls, and the ones that are broken in half are what look like the crinoid stems.
I have a saw to cut this in half for a better look, but I want to gain a better understanding of it in case cutting it up would devalue it.
Thanks again :)
Are you saying the inside is made up of balls rather than disks?
Here’s a better pic of the insides. The wet part in the upper corner is where I just tested it with vinegar.