Now in a thoroughly updated new edition (the first since 1995), Petrology remains the most student-friendly undergraduate level text covering all three major rock groups. As always, the new edition organizes a vast body of literature from its wide-ranging subject, presenting what is essential to geology majors in a way that is accessible and at an appropriate level.  The new edition welcomes Brent Owens as the new lead author for the chapters on igneous rocks, complementing Harvey Blatt€s role for the sedimentary chapters, and Robert Tracy€s for the metamorphic chapters.