Bentonite is Bentonite, not white or green. Always ask the country of origin, Bentonite comes from the USA and is something to do with volcanic ash. I just read in the link posted below that you can get Bentonite from India but I am sure this would be very hard to come by.
And always ask for pharmaceautical grade clay. If you can swallow it, then it's going to be safe for your skin.