Excerpt from An Elementary Treatise on Quartz and Opal: Including Their Varieties, With a Notice of the Principal Foreign and British Localities in Which They Occur From the very favourable reception accorded to the first edition, the Author was induced to continue his researches, with the view of bringing out a new Edition on a considerably extended scale. The lists of localities have been revised and extended; many new analyses given; and great pains taken in rendering the lists of synonymes as complete as possible, many scarce works having been consulted for the purpose; so that it is confidently expected this edition will be found more worthy of the attention of scientific men. 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.