Synopsis top ↑
The long-awaited English edition of the 4th German edition of Tröger’s “Determinative Tables” has now been published. These “Determinative Tables”, as Part I of the complete work, together with Part II, the “Text Volume” (available in German), supplement each other.
The “Determinative Tables” contain the optical data necessary for mineral identification in easily surveyable form. The new edition largely retains Tr6ger’s widely acknowledged system. The minerals are dealt with in order of increasing refractive index within the three large, optical groups, i.e. isotropic, uniaxial find biaxial. They are also displayed in a key diagram, in which refractive indices are plotted against bire-fringence.
Each of the 293 rock-forming minerals - presented has a fixed code number which recurs" in all other parts of the “Determinative Tables” and in the supplementary “Text Volume”. For most of the minerals, spective crystal drawings or crystal sections showing the orientation of the optical indicatrix are given. This method of illustration, introduced by Tröger, has been widely accepted for recognizing the optical features of a mineral, and has been adopted in many publications.
Relationships between optical properties, density, and chemical compositon are represented diagrammatically wherever appropriate. A collection of nomograms facilitates the evaluation of the optical measurements. As appendices, stereograms are included with the best_ possible migration curves for plagioclase determination, plus a colored Michel—Lévy chart of interference colors. In addition, the book contains a table with the d-values of the 4 strongest lines, and some diagrams, supplemented by X-ray data.
The “Determinative Tables” have been widely acclaimed in the past and have become indispensable to many earth scientists throughout the world. This latest edition with some corrections made by the authors and translator against the German version remains a must for every petrographer.
Of interest to: Mineralogists, petrographers, geologists, economic geologists, mining engineers, soil scientists, chemists, and their research institutes; the mining and ceramic industries, scientific libraries.