Ge 115 a. Petrology and Petrography: Igneous Petrology. 6 units (3-0-3); second term. Prerequisite: Ge 114 ab. The mineralogical and chemical composition, origin, occurrence, and classification of igneous rocks, considered mainly in the light of chemical equilibrium and of experimental studies. Detailed consideration of the structures, phase relations, and identification of the major igneous minerals.