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
http://i1141.photobucket.com/albums/...9/e29e38cd.jpg
With slurry made from a Cnat slurry stone.
http://i1141.photobucket.com/albums/...9/0e440aee.jpg
Side view
http://i1141.photobucket.com/albums/...9/4d1216d7.jpg
One of the broken corners
http://i1141.photobucket.com/albums/...9/ca1dc962.jpg