Excerpt from Elements of Mineralogy, Crystallography and Blowpipe Analysis: From a Practical Standpoint The introductory portion of Part III., Descriptive Mineralogy, has been carefully revised and rewritten, a chapter added upon Oc currence and Origin of Minerals; the discussion of chemical com position and chemical relations of minerals made more thorough; the optical portion simplified and the phenomena of radioactivity, fluorescence and phosphorescence described. 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.