Hi - I am trying to get some information on additives to wedge into cone 6 clay to get a very textured/lumpy effect.  I read that you can add granular feldspar, flint or granite to your clay.  I am looking for a really rough texture that also has bits coming out of the clay.  If so, can you please advise on how much to use per pound of clay, as well as the firing specs?  I typically bisque to cone 04 and fire to cone 6.    If I am way off here, and what I am suggesting will not work, if you