. "where M is an alkali metal, preferably sodium, N is another alkali metal, preferably potassium, and Q is a cation derived from the templating agent, preferably a choline cation, a benzyltrimethyl ammonium cation, a benzyltriethyl ammonium cation or a cation derived from 1,4-diazabicyclo (2,2,2) octane." . . .