A natural substance, a solid aggregate of one or more minerals or mineraloids.
The consolidate description of rock's properties is called lithology.
The major groups of rocks / lithology are defined as:
The scientific study of rocks is called Petrology, which is an essential component of Geology.
See also
Petroleum Industry / Upstream / Subsurface E&P Disciplines / Petroleum Geology + Petrophysics / Petrology
[ Rock types ] [ Rock formations ] [ Sedimentary ] [ Igneous ] [ Metamorphic ]