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Excerpt from Mineralogy and Crystallography: Being a Classification of Crystals According to Their Form and an Arrangement of Minerals After Their Chemical Composition Crystallography, while it is of great value to the chemist and natural philosopher in their researches, is so important a branch of Mineralogy, that it is impossible to make any progress in that science without some knowledge of its principles. We therefore intend to make our Treatise on Crystallography serve as an introduction to Mineralogy. The hardness, specific gravity, chemical composition, and other properties of minerals, as well as the localities in which they are found, and their scientific arrangement, will follow the Treatise on Crystallography. Crystallography. - In the mineral kingdom a great variety of solid bodies are met with, bounded by plane smooth surfaces. These bodies are called crystals, and it is the province of the science of Crystallography to investigate their mathematical properties, to classify and arrange them. The surfaces of crystals are not always plane they are sometimes curved; but these curved surfaces are comparatively rare. Crystals are not confined to the mineral kingdom; they occur very frequently among the products of the chemical laboratory. Almost all the salts, and a great many other substances, under favourable circumstances, assume the form of crystals. Some crystals are very simple in their forms, and prc sent solids remarkable for their symmetry; while others are exceedingly complex, being bounded by more than a hundred different surfaces. 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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