Feldspars and Feldspathoids

1. Front Matter

   Pages i-xvii

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2. Feldspars

   1. Average Structures of Alkali and Plagioclase Feldspars: Systematics and Applications

      • Paul H. Ribbe

      Pages 1-54

   2. Phase Relations of Plagioclase Feldspars

      • Joseph V. Smith

      Pages 55-94

   3. The Modulated Structure of the Intermediate Plagioclases and Its Change with Composition

      • Masao Kitamura, Nobuo Morimoto

      Pages 95-119

   4. Spectroscopy of Feldspars

      • Gerhard Lehmann

      Pages 121-162

   5. Thermal Expansion of Alkali Feldspars

      • Herbert Kroll

      Pages 163-205

   6. Mechanical Properties of Feldspars

      • M. Gandais, C. Willaime

      Pages 207-246

   7. The Exchange Equilibrium Distribution of Alkali and Alkaline-Earth Elements between Feldspars and Hydrothermal Solutions

      • Martine Lagache

      Pages 247-279

   8. Alkali Feldspar Exsolution: Kinetics and Dependence on Alkali Interdiffusion

      • Richard A. Yund

      Pages 281-315

   9. Feldspars and the Thermal History of Igneous Rocks

      • Ian Parsons, William L. Brown

      Pages 317-371

   10. Transmission Electron Microscope Investigations of the Microstructures of Microclines

       • A. C. McLaren

       Pages 373-409

   11. Massif Anorthosites: Another Partisan Review

       • Jean-Clair Duchesne

       Pages 411-433

3. Feldspathoids

   1. Feldspathoids: Their Average and Real Structures

      • Stefano Merlino

      Pages 435-470

   2. Feldspathoid Stabilities and Phase Inversions — A Review

      • C. M. B. Henderson

      Pages 471-499

   3. Chemistry, Occurrence and Paragenesis of Feldspathoids: A Review

      • Alan D. Edgar

      Pages 501-532

4. Back Matter

   Pages 533-541

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The feldspars form the most abundant group of minerals in the crust of the Earth and Moon and also occur in many meteo­ rites. They playa fundamental role in all rock-forming processes at shallow depths, but are rare or absent from the upper mantle. Their detailed study is thus essential for the understan­ ding of such varied processes as magma genesis and differentia­ tion, metamorphism, al teration, erosion and sedimentation. This interest is show by the fact that two previous NATO Advanced Study Institutes on feldspars were held in Oslo in 1962 and in Manchester in 1972. The feldspars are particularly sui table for detailed studies, as they have very simple chemistry and develop some of the most complex microstructures known. The microstructures are often slow to form but are easily preserved, so that they are potentially extremely informative about the geological history of the rocks in which they occur. Furthermore, their study involves physical and chemical methods of increasing sophistication so that the results obtained are not always immediately understandable to research workers outside the field of modern mineralogy. Progress in knowledge about feldspars is probably slower in penetrating the fields of petrology and geochemistry than that on other mineral groups. For these reasons among others, i~ was particularly appropriate to hold a third NATO ASI on feldspars approximately ten years after the last one.

• chemistry
• geochemistry
• igneous rock
• metamorphism
• mineral
• mineralogy
• petrology

`...a valuable addition to an important field of mineralogy.'
Science, 229

• Laboratory of Petrology, University of Nancy I, Nancy, France

  William L. Brown

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