petrology

The branch of geology that deals with the origin, composition, structure, and alteration of rocks.

The study of rocks from the point of view of their mineralogical composition; lithology; petrography. By some this term is used in a more limited sense. See the quotation, and also petrography.

The department of science which is concerned with the mineralogical and chemical composition of rocks, and with their classification: lithology.

A treatise on petrology.

the study of the origin, composition and structure of rock

the branch of geology that studies rocks: their origin and formation and mineral composition and classification