GC
On the Bentonite and Pyrophyllite clay, a good source are pottery supply stores. The ones that cater to the purists that mix their own glazes, etc. The main one in PDX sells Bentonite for about the same price as Azomite ($19.00) and the Pyrophyllite is in the same price area.
Anyway, there are some interesting materials to consider using at these stores.
CC
On the Bentonite and Pyrophyllite clay, a good source are pottery supply stores. The ones that cater to the purists that mix their own glazes, etc. The main one in PDX sells Bentonite for about the same price as Azomite ($19.00) and the Pyrophyllite is in the same price area.
Anyway, there are some interesting materials to consider using at these stores.
CC