Minerals in rock sections

Chapter 3: PREFACE TO THIRD REVISED EDITION, 1908.

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About This Book

The book provides a practical handbook for identifying rock-forming minerals under the microscope by presenting essential optical theory, descriptions of petrographic microscope components, and step-by-step investigation techniques. It explains light behavior in crystals, methods for measuring refractive indices and birefringence (including Becke and van der Kolk procedures), interpretation of pleochroism, interference colors, extinction angles and interference figures, and criteria for distinguishing crystal systems. Individual minerals are described by their microscopic characters and typical appearances in thin section. Chapters also cover preparing and mounting thin sections, useful tables and diagrams, and simple chemical and mechanical tests.

PREFACE TO THIRD REVISED EDITION, 1908.

The 1908 edition is essentially the same as that of 1905; the only changes being in the nature of corrections, and the addition of a brief description of the Schrœder van der Kolk method of determining refractive indices and also an abbreviated diagram for determining triclinic feldspars in sections showing both Carlsbad and Albite twinning. The Naumann symbols for crystal forms have also been omitted.

Lea McI. Luquer.

Department of Mineralogy,

Columbia University, New York, April, 1908.