Economic Geology: Or, Geology in Its Relations to the Arts and ManufacturesW. Blackwood and sons, 1874 - 336 páginas |
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Página 20
... , from its appear- ance , though entirely devoid of lead ) is almost pure carbon , containing only slight traces of iron and earthy impurities . Bitumen is an inflammable mineral substance ( hydrocarbon ) , 20 THE ROCKY CRUST :
... , from its appear- ance , though entirely devoid of lead ) is almost pure carbon , containing only slight traces of iron and earthy impurities . Bitumen is an inflammable mineral substance ( hydrocarbon ) , 20 THE ROCKY CRUST :
Página 22
... ejections . ( The Metallic Group . ) The metals are found either native - that is , in a pure state - or combined with mineral matter in the state of ores . Gold , silver , platinum , copper , and one or two others , are found native in.
... ejections . ( The Metallic Group . ) The metals are found either native - that is , in a pure state - or combined with mineral matter in the state of ores . Gold , silver , platinum , copper , and one or two others , are found native in.
Página 45
... pure contain about 50 per cent of phosphate of lime . Well - cleaned examples from Cambridgeshire have been found to yield - phosphates 61 , car- bonates 28 , insoluble silicious matter 7 , and water , with traces of organic matters , 4 ...
... pure contain about 50 per cent of phosphate of lime . Well - cleaned examples from Cambridgeshire have been found to yield - phosphates 61 , car- bonates 28 , insoluble silicious matter 7 , and water , with traces of organic matters , 4 ...
Página 72
... pure air of the country , many of them waste under the carbonated atmos- phere of towns ; and even the best of them , after a few years ' exposure , have a bleached and cold appearance . They are found in all the geological systems ...
... pure air of the country , many of them waste under the carbonated atmos- phere of towns ; and even the best of them , after a few years ' exposure , have a bleached and cold appearance . They are found in all the geological systems ...
Página 75
... pure air of the country , as may be seen in several of the old castles , churches , and public buildings in the districts above referred to . The limestones of the Permian System are mainly Magnesian -that is , consist of carbonates of ...
... pure air of the country , as may be seen in several of the old castles , churches , and public buildings in the districts above referred to . The limestones of the Permian System are mainly Magnesian -that is , consist of carbonates of ...
Outras edições - Ver tudo
Economic Geology: Or, Geology in Its Relations to the Arts and Manufactures David Page Visualização integral - 1874 |
Economic Geology: Or, Geology in Its Relations to the Arts and Manufactures David Page Visualização integral - 1874 |
Economic Geology: Or, Geology in Its Relations to the Arts and Manufactures David Page Visualização integral - 1874 |
Palavras e frases frequentes
abundant admixture agricultural alumina amount antimony arsenic artificial arts and manufactures basalts beds bismuth bituminous blocks borax Britain calcareous carbonate carbonic acid Carboniferous cements chalk chemical chiefly chloride clay coal colour compact composition consists containing copper crust crystalline crystals deposits Derbyshire districts durable earth employed engineer extensively felspar fire-clay formations gems geologist Geology gold granites greenstones grits gypsum hard heat hence hydraulic ingredients iron ironstones known lignites lime limestones lustre magnesia manganese manures marbles masses material metamorphic mineral and metallic mortar nature obtained occasionally occur Oolite ornamental oxide peat pigments polishing porphyries potash preparation purposes pyrites quarries quartz require rocks saline salts sand sandstones schists serpentines shales silica Silurian silver soda sodium soft soils specific gravity springs stones strata stratified structure substances sulphate sulphide sulphuric acid surface tertiary texture thickness tints tion tons usually varieties various vary veins volcanic yellow yield zinc