The South African Mining Journal and Engineering Record, Vol. 27: With Which Is Incorporated South African Mines, Commerce and Industries; Part II., May 25, 1918 (Classic Reprint) - Softcover

Inhaltsangabe

Excerpt from The South African Mining Journal and Engineering Record, Vol. 27: With Which Is Incorporated South African Mines, Commerce and Industries; Part II., May 25, 1918

The crystal corundum is picked up on the surface and recovered by sifting and washing from the thin soil and sub-soil of the area, having evidently been released by weathering from the underlying rocks. The crystals from diflerent parts of the Zoutpansberg fields-exhibit consider able differences in size, habit, colour, and structure, which are so marked that experts can sometimes tell at a glance where a particular consignment comes from. Their size ranges from microscopic dimensions to a length of ten inches and a diameter of five inches. They are frequently pyramidal in habit, being bounded by steep bi-pyramids. Crystals bounded by the unit prism, the basal pinacoid and one or more rhombohedrons, or more rarely simply by the unit prism and basal pinacoid, are, however, very common.

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.

Die Inhaltsangabe kann sich auf eine andere Ausgabe dieses Titels beziehen.