Petrology

Petrology (from Ancient Greek πέτρος (pétros) 'rock' and -λογία (-logía) 'study of') is the branch of geology that studies rocks, their mineralogy, composition, texture, structure and the conditions under which they form. Petrology has three subdivisions: igneous, metamorphic, and sedimentary petrology. Igneous and metamorphic petrology are commonly taught together because both make heavy use of chemistry, chemical methods, and phase diagrams.

Extends: Petrology, [Petroleum geology](https://wikipedia.org.ai/Petroleum geology), [Oilfield terminology](https://wikipedia.org.ai/Oilfield terminology)