Petrology

From Simple English Wikipedia, the free encyclopedia
The black rocks are "pelite", a metamorphosed fine-grained sedimentary rock, i.e. mudstone or siltstone

Petrology is a type of geology. It is concerned with rocks, how they form, and how they are used. It is between mineralogy, which is concerned with the minerals, in rocks, and geology, which tries to put rocks into a larger context.