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The invention relates to a porous crystalline material which, in the calcined state, has composition: X2O3: n YO2: m ZO2, wherein: X represents a trivalent element; Z represents Ge; and Y represents at least one tetravalent element other than Ge. Furthermore, in the chemical composition, (n + m) is equal to at least 5 and the Y/Z ratio is equal to at least 1. Moreover, in the calcined state, said material has an X-ray diffraction pattern which coincides substantially with (1), wherein MF is a very strong relative intensity corresponding to a percentage of between 80 and 100 with respect to the most intense peak; M is a mean relative intensity corresponding to a percentage of between 40 and 60 with respect to the most intense peak; and D is a low relative intensity corresponding to a percentage of between 20 and 40 with respect to the most intense peak. (FIG. 1)