The Kola Peninsula, Russia, has one of the world's most extreme, and thus important aspects of ultrabasic, alkaline rocks and carbonatites. Topics in this book include introductions to the Kola Alkaline Province and phoscorites; timing of Kola alkaline magmatism; minerology, geochemistry and petrogenesis of six complexes at Kovdor, Sokli, Sallanlatvi, Afrikanda, Vuoriyarvi and Turiy Mys; a review of stable isotope data and resulting petrogenetic interpretations; a petrogenetic interpretation in the context of a mantle plume; and a comprehensive review chapter on economic deposits.