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Many interesting and perplexing questions arise in connection with the highly potassic volcanic associa tion dominated by mafic and ultramafic rocks contain ing leucite. Its occurrence is very restricted as compar ed with the olivinebasalt trachyte kindred, but it is distributed at widely scattered points on all the conti nents, and its chemical and petrographic individuality is both remarkable and constant. A considerable litera ture is available related to the mineralogy, petrology, geochemistry, phase chemistry, distribution, and origin of this interesting suite of rocks. It seemed that there was a genuine need for a reviewsynthesis of all these data, which would be intelligible to a wide spectrum of advanced students and professionals in the earth sciences. The monograph may be divided into two parts. The first part consists of six chapters in which the mineralogical and chemical peculiarities of leucite bearing rocks and their nomenclature, petrology, min eralogy, distribution, and physical and chemical condi tions of formation are discussed. Phase equilibria stud ies on many leucitebearing ternary, pseudoternary, quaternary, and pseudoquaternary joins and systems, studied by different investigators at variable tempera tures in air, are described in the second part in Chap ters 7 to 12. Survival of leucite and formation of pseu doleucite is discussed in Chapter 13. Leucitebearing synthetic and natural rock systems studied at different temperatures under variable pressures in presence or absence of water, are summarized in Chapters 14 and 15.
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