Petrology is the branch of geology that studies rocks and the conditions under which they form. Petrology has three subdivisions: igneous, metamorphic, and sedimentary petrology.

What is a Petrologists?

: a science that deals with the origin, history, occurrence, structure, chemical composition, and classification of rocks.

What is meant by mineralogy?

Mineralogy is the systematic study that extensively covers description, crystallography, physical, chemical and environmental features of all minerals.