Explore the intricacies of igneous petrology in this comprehensive video lecture. Delve into the distinctions between modal and normative mineralogy, and understand the concepts of compatible and incompatible elements. Learn to interpret Harker diagrams and master various major element indices, including the alkali-lime index, iron-enrichment index, aluminum saturation index, alkalinity index, and feldspathoid-silica saturation index. Discover the significance of trace elements in igneous rocks and grasp the importance of partition coefficients in deciphering a rock's cooling and crystallization history. Gain valuable insights into the composition and formation of igneous rocks through this in-depth exploration of mineralogical and geochemical concepts.