Practically this is not at all necessary. But theoretically, would hydrous/hydrothermal synthesis be enough (like mix 1 mole alumina gel and 4 mole silica gel and gently heat) or would it require combining the oxides in fused state to form feldspar/mafics that would be later hydrothermally treated to form clay? If not directly, then mediated by which agent? If not even possible to make the clays indirectly, then why?
Yes you can, there is a large literature on hydrothermal synthesis of clay minerals starting from amorphous gels of the oxides prepared in various ways. It should be quite easy to locate publications on this.
Dear Sumit Bhowmick please see this potentially useful article entitled
"Chapter 7.2. Synthesis of Clay Minerals"
Article Chapter 7.2. Synthesis of Clay Minerals
Unfortunately the article is not available as public full text o RG, but you can request a pdf from the authors.
P.S. Please find attached an interesting review article entitled
"CLAYS, CLAY MINERALS AND CORDIERITE CERAMICS - A REVIEW"
In this review article "The nomenclature and characteristic structural properties of clays, clay minerals talc, kaolin, vermiculite, ceramic raw materials, cordierite ceramics, cordierite and cordierite polymorphs were summarized.
Mineral phases in clay mixtures and cordierites sintered at 1300°C were compared."
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