The Elements of economic geology

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Monograph

Identifikator:: 867029366

URN:: urn:nbn:de:zbw-retromon-93011

Document type:: Monograph

Author:: Smith, George Otis http://d-nb.info/gnd/117634530

Title:: Our mineral reserves

Place of publication:: Washington, DC

Publisher:: Gov. Print. Off.

Year of publication:: 1914

Scope:: 1 Online-Ressource (48 Seiten)

Collection:: Economics Books

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CONTENTS y xh CHAPTER IX ORES oF Iron 7 . : Iron—History and Qualities. Ore Supplies. Classification of Iron-ores. Igneous Ores—Titaniferous Magnetites, Con- tact Ores. Primary Lodes—Czecho-Slovakia and Westpha- lia. Replacement Ores—Pyritic Masses, Oxide Ores. Bodies due to Descending Solutions—Cumberland, Bilbao, Lake Superior, Gellivaara, Adirondacks, and Mid Sweden. Ancient Surface Sheets—Kiruna, Bedded Ironstones. Aqueous Pre- cipitates. Blackband Ores. Bog Iron Ores. Surface Ores —Efflorescent, Residual, and Alluvial Ores, PAGE 129 CHAPTER X Ores or MANGANESE AND CHROMIUM Manganese Ores. Chromium CHAPTER XI ORES oF ALUMINIUM, INCLUDING Bauxite Aluminium—TUses and Separation. Bauxite. , 2 PART III EARTHY MINERALS CHAPTER XII THE Micas, ASBESTOS, AND GEMS . . . ’ , . 15% The Micas—Distribution and Uses. Pneumatolytic Origin. Mining Economics. Asbestos. Monazite. The Gems—Diamond, South Africa, Brazil; theories of formation based on supposed artificial diamonds. Corundum group. Miscellaneous gems—Topaz, Zircon, Jade, Lapis Lazuli, Garnets, Olivine, Opal. CHAPTER XIII Cray . . . 168 Essential Properties of Clay. China Clay—Pneumatolytic Origin, German Deposits of various modes of formation. Fuller's Earth. CHAPTER XIV BUILDING STONES AND ROAD METALS . 3 * . 175 Building Stones. Causes of Decay. Tests of Building Stones. Microscopic Examination—Panama * Breaks.” Varieties of Building Stones. Stone Preservation, Road Metals

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