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Production of a crystalline lamellar solid (I), selected from magadiite (Ia) and kenyaite (Ib), involves : (i) mixing silica source(s), 2-5C alpha , omega -n-alkanediol(s) (II) (as organic structuring agent), alkali(ne earth) metal component(s) and water; and (ii) hydrothermally treating the mixture.