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Excerpt from Pegmatite Investigations, 1942-1945, Black Hills, South Dakota Tantalum minerals are recovered as byproducts of pegmatite mining. They are most abundant in lithia-bearing pegmatites. The proportion of Ta205 in columbite - tantalite increases toward the center of the pegmatite. Microlite occurs only with lepidolite. Tin occurs as cassiterite in the pegmatites and in associated pegmatitic quartz veins wall-zone, (2) intermediate zone, (3) core, (4) replacement, and (5) vein deposits. Some feldspar-bearing pegmatites were studied in the course of other investigations, but no detailed examinations of these deposits were made. It is apparent, however, that the feldspar rich units are similar in structure to deposits of other pegmatite minerals. 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.

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