R.K.
I have been studying herbal and holestic healing for 20 yrs and I have never heard of anyone injesting clay unless it was a pica. A pica is a craving for a non food item. You honestly don't know anything about this clay and I would not injest it. Using it as a skin mask would be bad enough. Clay can be filled with so many impurities. Did you know arsenic comes from a certain rock? It could so easily be washed into clay by rain.
I also found it quite interesting that the ad for Bentonit Clay ran on the side of the page your question is on.