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Excerpt from The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science, Vol. 47: Fourth Series; January-June, 1874 <p>Prof. J. P. Cooke on the Vermiculites their Crystallographic and Chemical Relations to the Micas; together with a dis cussion of the Cause of the Variation of the Optical Angle in these Minerals (with a Plate.) <p>About the Publisher <p>Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com <p>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.