Our previous work showed that colloidal structure-directing-agent-free hydroxy-sodalite nanocrystals could be synthesized by the direct transformation of silicalite nanocrystals. The structure directing agent TPAOH molecules trapped in the dried silicalite nanocrystals proved to play an important role in confining the structure transformation. In the presence of TPAOH, silicalite nanocrystals reacted with alkaline NaO-Al2O3 aqueous solution and formed hydroxy-sodalite nanocrystals without substantial change in the sizes and morphologies. In this presentation, different colloidal silica sources were used to examine the effect of the crystalline structure of starting nanoparticles. The results indicated that sodalite crystals and a mixture of zeolite A and sodalite crystals were produced, and their sizes ranged from less than 100 nm to a couple of microns when amorphous colloidal silica nanoparticles were used. This again suggests that a combination of silicalite nanocrystals and TPAOH is advantageous for formation of hydroxy-sodalite nanocrystals.