Economic Geology, Volume 8Economic Geology Publishing Company, 1913 - Geology |
Contents
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Common terms and phrases
acid alidade alkaline altered alunite amount analyses andesite anticlines apatite appears average base biotite bornite Bull calcite carbonate cent chalcocite chalcopyrite chemical color composition contain copper County covellite crystals deposits depth determined district ECON ECONOMIC GEOLOGY enrichment error feet feldspar ferric sulphate field formation formed fossils galena garnet geologist gold grains granite igneous rocks ilmenite inch intrusive iron kaolin limestone lode magmatic magnetite material measured metals metamorphism metasomatic method microscope miles minerals mining notes observed occur original orthoclase outcrop oxidation paper plane plane-table polybasite precipitation present probably pyrite pyrrhotite quartz reaction recorded recrystallization Red beds region replacement rhyolite sample sand sandstone secondary sericite shales Shinarump silicates silver solution specimen sphalerite structure sulphides sulphuric surface thick tion topographic tourmaline traverse U. S. Geol U. S. Geological Survey veins zinc zone