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005ChemInform Abstract The calcined form of a polycrystalline material with H2Si2P18Al20O80 (I) composition crystallizes in the orthorhombic space group Pna21. Adsorption of cyclohexane at room temp. on the CAL form yields the CYC form ((I), 2 C6H12), which crystallizes back into the orthorhombic space group Ima2 of the SYN form. Therefore, the adsorption energy of cyclohexane on the low-symmetry nonferroic Pna21 framework is high enough to induce the reverse phase transition and stabilize the high-symmetry structure.