Excerpt from Sand and Clay: Their Analysis and Physical Properties The schistose rocks produce a sand with lobular shaped grains which are very tender {and soon reduced to a powder when washed by rains and currents of water. The granite rocks produce a sand composed of grains of felspar, mica, and quartz whilst volcanic rocks furnish lavas of all kinds. The fossil sands are found deposited in situations where now neither brooks nor rivers flow they generally have a more angular grain than sea or river sand, but consist mainly of the same constituents. A sand belonging to the fossil order is the arene sand; it is generally quartzose and composed of very irregular and um equal grains it is found united with clay in pro portions varying from one to three fourths. 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.