A Key for the Determination of Rock-Forming Minerals in Thin Sections (Classic Reprint) - Hardcover

Johannsen, Albert

9780332114798: A Key for the Determination of Rock-Forming Minerals in Thin Sections (Classic Reprint)

Hardcover

ISBN 10: 0332114791 ISBN 13: 9780332114798

Publisher: Forgotten Books, 2018

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Excerpt from A Key for the Determination of Rock-Forming Minerals in Thin Sections

Tables for the determination of minerals have heretofore been made of secondary importance in text books. In this volume the reverse method has been adopted and the de scriptive tables make up the greater portion of the book. Theoretical discussions in optics have been avoided so far as possible, and only enough has been given to make clear that which is necessary for the practical determination of the minerals. The material has been condensed as much as is consistent with clearness, and all of the descriptions are given in as concise a form as possible.

Owing to the difficulty of having the pages of the index indented by machinery, it was found necessary to extend the leaves to the full width of the book, and to indicate the lines along which the student should cut the pages. After trim ming along the lines shown, it will be found convenient to form another index guide by cutting off about one-half inch from the upper right hand corners of the pages descriptive of negative minerals.

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