COMMUNICATIONS materials causes the condensation of the silicate layers, giving the zeolite structures MCM-22 and ferrierite. Similar behavior can also be expected for RUB-15, since the silicate layer terminated with silanol groups should be the perfect subunit for the formation of the silica framework of the zeolite sodalite. Experimental ProcedureRUB-15 crystallized from a reaction mixture with the following composition: SiO,:TMAOH:H,O = 1.00:0.75:55.52 The solution was filled in Teflon-lined autoclaves (60% filling factor) and kept in an oven at a temperature between 120 and 140 C for about four weeks. The reaction product was filtered, washed with distilled water. dried at 80 c. and subsequently identified by X-ray powder diffraction.

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