Abstract: Disclosed is a process of making pigment coated paper useful for both carbonless copy paper and inkjet printing paper. The pigment comprises mesoporous silico-aluminates from calcium bentonite by controlled extraction of octahedral aluminum under mild condition, by acid, preferably phosphoric acid. The mesoporous silicoaluminates contain only tetrahedral aluminum as the residual aluminum. As the result of the selective removal of the octahedral aluminum, the mesoporous silico-aluminates have several unprecedented properties compared to products produced by conventional processes either by mild acid-activation or by a removal of all the aluminum. The mesoporous silicoaluminates are formulated with polyvinyl alcohol as the binder.