Proceedings of the Academy of Natural Sciences of Philadelphia, 1884 (Classic Reprint)

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Excerpt from Proceedings of the Academy of Natural Sciences of Philadelphia, 1884It proves upon examination to be an almost perfectly pure car bonate of lime, containing occasionally slight impurities of iron, etc. It is a loose grained, white, crystalline limestone, the grains of which are but slightly coherent, giving the rock the appear ance of a soft sandstone. Upon slight abrasion in the hand, it crumbles to form a coarse, calcareous sand. Under the micro scope the rock appears as a loose mass of irregular, angular grains, which are nearly transparent, and. Which have a lustre resembling that of alum. Portions of the rock are colored slightly yellow by oxide of iron.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis 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.