Hey guys I bought this stone last weekend at an antique store for $8 it was originally set in a block of wood. I bough it thinking it was a thuringian but after posting it on multiple forums some people said it looked like a CF in some photos and a thuringian in others. Here's the pics of it after i lapped it, it wasn't real hard so that's why I was steering away from a CF.
Dry

With slurry made from a Cnat slurry stone.

Side view

One of the broken corners