Clay, charcoal, tea tree oil, all are good for acneic skin.
I make an acne bar for my teenage son, It's a general soap using coconut, palm, olive and castor. I superfat at 8% and add kaolin clay and tea tree oil. You can use some lavender to mellow out the tea tree if you don't like the smell. I do though.
I get hormonal breakouts, and a 100% Coconut, 20% superfat salt bar does me the world of good. You know when you go to the beach and the salt water dries out your skin and it feels really good? It's just like that.