Were yours sort of like hardened lard, for lack of a better description? Mine were, rather like the consistency of the harder, yet not calcified, green stones I'd gotten out, and I had 6-8 of these white ones, ranging in size from 1/2"-1" and just a little tan sludge after my 11th (I think) flush. Since then no other white ones, just a few greenies.
I'm wondering if they are a different kind of stone or from a certain part of the liver or gallbladder? Check back on the previous forum page where I posted about my white stones and read those responses. I wasn't able to find out any more then got sidetracked doing the Master Cleanse.