Crystallographic techniques are used in chemistry for two main reasons: the identification of solid substances and the determination of atomic configurations; there are also other applications, most of which, as far as methodology is concerned, might be said to lie between these two main subjects. This book is intended to be a guide to these methods. A fascinating text that will greatly appeal to enthusiasts of mineralogy and gemmology, this scarce book will make a great addition to any such collection of literature. Chapters contained within this text include: Identification of crystals under the microscope, Origin of anisotropic properties of crystals, Molecular type and arrangement deduced from anisotropic properties of crystals, The use of X-rays, Electron density maps, Limitations of X-ray methods, Use of X-ray diffraction patterns for identification, et cetera. We are proud to republish this rare text with a new introduction to the subject.