This book investigates the geochemical distribution and behavioral regularities of rare earth elements (REE) within ultramafic and mafic rock formations. Author Felix P. Lesnov synthesizes extensive global literature, analytical data, and theoretical frameworks to explain how these elements manifest in mantle restites, mantle xenoliths, and magnesium-rich hypabyssal rocks. The text provides a comprehensive overview of the chemical and mineralogical compositions that dictate the presence of these elements in the Earth's crust and mantle.

Experts recognize this work as a specialized reference for petrologists and geochemists focused on mantle composition. Readers frequently note the high technical density of the prose, which serves as a foundational resource for understanding trace element distribution in igneous systems.