Arcillite is a calcined montmorillonite clay
turface is arcillite (brand name for arcillite)
montmorillonite clay is only beat by vermiculite for high CEC
kilned it's fill of tiny holes
raw it's clumping cat litter (cheapest source i can think of)
kilned it goes by several names, 'turface' is one of them.
Arcillite vs. montmorillonite clay ...
i do not know if this affects it's CEC, i could hope not, but honestly, this is hard information to find
once people take it for granted that the clay has a high CEC, cooking it shouldn't change that right ?, ... unfortunately the bakery shop begs to differ that for some things cooking changes their chemical nature, ... and cake is tastier than raw batter to me, definitely different.
the reality of if it's CEC is affected or not, ... good question