This is an ammonite fossil where the animal was replaced by agate. This gives it a lovely warm brown color with a slight bit of translucency. The shell has been polished off so you can see the fractal segments inside the shell. There are a few bits of shell remaining on this piece in which you can see a bit of opalescence.
This piece measures approximately 13.3cm x 10.5cm x 3.1cm.
