The problem is that, as I said, I need to analyse what is trapped inside the zeolite, so I need to keep it in an aqueous phase.
I'm guessing that most of the Al has gone away with the HNO3 and what I have now is basically a three-dimensional structure made of silicates. Basically, I think I have some sort of sand. Is anything strong to dissolve sand?
I know that HF attacks glassware, which, I guess, is basically a polisilicate structure. Maybe I can use the same principle to destroy the zeolite.