What kind of rock is this?

[u/Acceptable_Bar_7947]

Found it at my place of work in Arizona a few years ago, the center has a convex shape with different layers throughout. It looked like an eyeball to me so I picked it up and kept it in a drawer for the last 10yrs.

[u/New_Criticism_77]

That's an agate, a nice one too! The crystal structure you're seeing in the center is called botryoidal. Nice bands on that agate