A Key For The Determination Of Rock-Forming Minerals In Thin Sections is a book written by Albert Johannsen and first published in 1908. It is a comprehensive guide that provides a systematic approach for identifying the various minerals that make up rocks in thin sections. The book is intended for use by geologists, petrologists, and mineralogists who study rocks under the microscope.The book is divided into two main sections. The first section provides an introduction to the study of rocks in thin sections, including the tools and techniques used in the process. The second section is a detailed guide to identifying the different minerals that make up rocks. The guide includes over 200 photomicrographs of minerals in thin sections, along with descriptions of their physical and optical properties.The book is considered a classic in the field of mineralogy and has been widely used by geologists and petrologists for over a century. It is still considered an essential reference for anyone studying rocks and minerals in thin sections.This scarce antiquarian book is a facsimile reprint of the old original and may contain some imperfections such as library marks and notations. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions, that are true to their original work.