Determinative Mineralogy

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Excerpt from Determinative Mineralogy: With Tables for the Determination of Minerals by Means of Their Chemical and Physical CharactersThe present edition differs from the first chiefly in the full restatement with each section of the tables of the classificatory characters and tests leading up to it. This adds much to the convenience of the tables for reference, since the complete description of a mineral, both physical and chemical, will now be found at one place. The supplementary tables at the end have also been adapted to a wider use by the inclusion of specific gravity and composition, in addition to luster, crystallization, and hardness, so that they may be used for the rapid determination of minerals by means of their physical properties, even in the absence of crystals.Several more delicate tests that have been introduced in both the text and the tables will aid in the detection of minute quantities of an element or in making distinctions that are usually difficult and unsatisfactory. Among the former may be mentioned the purple of Cassius test for gold, the reduction of tungsten compounds on aluminum, and the ruby bead for copper and tin. The distinction of aragonite from calcite by means of cobalt nitrate solution is an example of the latter type, while the beautiful dimethylglyoxime test for nickel falls into both categories, since it serves not only for the recognition of nickel compounds in the presence of cobalt, but also for the detection of minute traces of nickel. The reduction of cassiterite through the action of nascent hydrogen is also a simple and thoroughly conclusive test for a mineral that often proves troublesome to the beginner.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.