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Activity equilibrium diagrams for minerals and coexisting fluids (melts or aqueous solutions or both) are fundamentally important in the characterization of rock-forming processes. A survey of recent literature, however, indicates an unfortunate decline in the determination and utilization of such data despite the fact that without phase equilibria information, petrologists and geochemists cannot hope to understand the physicochemical principles that govern rock-forming processes. The group at the Theoretical Geochemistry Laboratory at University of California, Berkeley, whose recent work is summarized in this book, is among the too few exceptions in this regard.