Geochemistry and petrology of pegmatites and pegmatite-granite systems, geochemical exploration for pegmatite deposits; mineralogy and geochemistry of oxide minerals, feldspars and micas. Gem bearing Pegmatites. Origin and internal evolution of granitic pegmatites. Determining the solubility and behavior of high field strength elements (Nb, Ta, Zr, Hf, W and Sn) in granitic melts as a function of melt composition, P, T, fO2 and water content of the melt. W, Sn, and Be griesen deposits; and alkaline rocks and their associated pegmatites. Crystallization dynamics of highly evolved Pegmatite-Aplite Systems. Role of Anatexis in the origin of Pegmatites. Geochemical and fluid – melt inclusion studies of fluid and melt processes in the crust of the earth.