Fig. 10: Scheme of the glass alteration mechanism by dissolution/precipitation in the presence of iron corrosion and claystone.

a Overview of such a mechanism, and b illustration of cyclic pH modifications leading to GAL consisting of several strata. SiO₂ tetrahedrons from the glass and nontronite structure drawn respectively by Calas et al.¹¹⁸. and Bailey et al.¹¹⁹.