The invention relates to a metallophosphate-type crystallized solid, referred to by the name IM-6, which exhibits an X-ray diffraction diagram as given below. This metallophosphate-type solid can be partially substituted by an element X and optionally by an element Y. Said metallophosphate exhibits a chemical composition, expressed on an anhydrous base, defined by the formula R_S,(G_gP_pX_xY_y)O₂, where G represents one or more trivalent element(s), R represents one or more organic compound(s), X represents one or more divalent element(s), Y represents one or more tetravalent element(s), and in which s0.2, g0.5, p0.5, x0.4, y0.3, with g+p+x+y=1.