Lithology

Petrology is the scientific study of the Rocks. Lithology is now a subdivision of petrology and Lithology deals with the macroscopic description of the rocks. Petrology exhaustively uses the Mineralology, Optical Mineralogy and Petrography and goes to the level of microscopic details.

Rocks essentially contain minerals. The aggregate of two or more minerals that form the considerable part of the Lithosphere is a Rock.