GAM-3: a zeolite formed from AlPO4-5 via multistep structural changes.

The interzeolite conversion of AlPO4-5 gave a new zeolitic material GAM-2 and the calcination caused further structural changes, forming a new zeolite GAM-3 with a 3-dimensional 12-8-6 ring pore system. This is the first synthetic example of a zeolite formed through multistep structural changes in the metastable phase.