Oh, fair enough.
Just a thought, the ground walnut shell that I buy is like tiny little balls, and I still find it horribly scratchy in soap. I have it in an emulsified scrub at the moment & like it much more in that use - maybe because it can roll across your skin rather than drag across it?
Anyway, my point is, how would you replicate this at home? I would imagine that putting it thru a coffee grinder would give you lots of tiny little shards - not something I would like to use! Maybe something to keep in mind...