Excerpt from The Decomposition of the Feldspars The stronger mineral acids and also various organic and humus acids have been supposed to aid in the k'aolinizing action. Such assumptions do not appear to be necessary or warranted in the light of late laboratory investigations. As a matter of fact dilute hydro chloric acid extracts very little more potash than does water alone. It is now well known that many glasses are more readily acted on by water than they are by acid solutions. The complex silicates, of which the feldspars are a type, are mainly insoluble, even in strong mineral acids, and the explanation of their natural decomposition as due to the action of carbonic, humus, and other weak acids is not satisfactory. 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.