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Excerpt from A Manual of Geometrical Crystallography: Treating Solely of Those Portions of the Subject Useful in the Identification of Minerals The system followed is not an untried experiment, but was introduced many years ago by Dr. H. B. Patton in the Colorado School of Mines where it has been taught with marked success, and from which it has been carried by graduates to a number of other institutions. This system includes the study of numerous wooden, cardboard, or plaster models of crystals, together with oral quizzes involving the instantaneous identification of the forms repre sented on such models, and discussions of the theo retical aspects of the subject. After models belong ing to a certain system or group of systems have been studied and a sufficient knowledge of them revealed in the quiz the student takes up the deter mination of natural crystals of the same degree of symmetry; and the study of crystal models and of corresponding natural crystals alternate throughout the course. If this plan is followed, it will be neces sary for the student to familiarize himself with the matter presented in Chapter IX before attempting to work with natural crystals. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

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