Abstract
An understanding of phase equilibria in specific silicate systems and the application of experimental data has led to significant advances in our knowledge of igneous processes. Important topics may be treated in a rigorous way in an introductory or first-year graduate petrology course. The principles of phase equilibrium in one, two, three, and four-component systems and pertinent petrologic examples of each type should be included in such a course. In addition, the application of experimental studies to the petrogenetic problems of various types of igneous rocks gives the student an appreciation of important aspects of igneous petrology. Three-dimensional scale models of phase equilibria in selected silicate systems can serve as useful instructional aids. Students find it easier to visualize and understand phase equilibria when depicted in well-labeled models.
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