Quote Originally Posted by thebigspendur View Post
If you want to tell if its slate for sure here is what you do. Get a nice broad chisel and wack it on it's side hard. Slate has perfect cleavage and you'll have two perfectly flat sections. If it all just breaks and crumbles you know its not slate and the coticule part? Oh well that's expendable in the test.

See? hasn't that been helpful?
Har and indeed, har.