Economic Geology: Or, Geology in Its Relations to the Arts and ManufacturesW. Blackwood and sons, 1874 - 336 páginas |
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Página 22
... yellow ) is a mineral of a greenish hue , and generally of a foliated texture , in which condition it forms the principal ingredient in the rocks known as chlorite - slate and chlorite - schist . Talc , a whitish - green magnesian ...
... yellow ) is a mineral of a greenish hue , and generally of a foliated texture , in which condition it forms the principal ingredient in the rocks known as chlorite - slate and chlorite - schist . Talc , a whitish - green magnesian ...
Página 34
... yellow , red , or bluish , from the greater preponderance of iron oxides . The soils are also more or less friable in their texture , while the subsoils are tougher , more compact , and more largely commingled with rubbly and stony ...
... yellow , red , or bluish , from the greater preponderance of iron oxides . The soils are also more or less friable in their texture , while the subsoils are tougher , more compact , and more largely commingled with rubbly and stony ...
Página 66
... yellow ; and these colours some- times fade , and sometimes become intensified by exposure to the weather . In structure , some are thick - bedded and homo- geneous , and others thin - bedded , laminated , and flaggy : the former ...
... yellow ; and these colours some- times fade , and sometimes become intensified by exposure to the weather . In structure , some are thick - bedded and homo- geneous , and others thin - bedded , laminated , and flaggy : the former ...
Página 68
... yellow , and creamy - white . Some of the Hereford and Monmouth beds are said not to be durable ; but many of the Perth and Forfar rocks tool well and stand well , and the same may be said of those of Cork and Kerry -Carmylie , Leysmill ...
... yellow , and creamy - white . Some of the Hereford and Monmouth beds are said not to be durable ; but many of the Perth and Forfar rocks tool well and stand well , and the same may be said of those of Cork and Kerry -Carmylie , Leysmill ...
Página 69
... yellow , buff , brown , and red ; in texture , from the finest and closest grain to coarse - grained quartzose and pebbly - quartzose grits ; and in durability , from rocks that will crumble down in a few years to others that will ...
... yellow , buff , brown , and red ; in texture , from the finest and closest grain to coarse - grained quartzose and pebbly - quartzose grits ; and in durability , from rocks that will crumble down in a few years to others that will ...
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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
abundance admixture agricultural alumina amount antimony arsenic arts and manufactures basalts beds bismuth bituminous blocks Britain calcareous carbonate carbonic acid Carboniferous cements chalk chemical chiefly chloride clay clayey coal colour compact composition consists containing copper crust crystalline crystals deposits districts durable earth employed engineer felspar fire-clays formations geologist Geology gold granites gravels Greensand greenstones grits gypsum hard heat hence hornblende igneous ingredients iron ironstones known largely lignites lime limestones lustre magnesia manganese manures marbles marls masses material metamorphic mineral and metallic mortar nature obtained occasionally occur Oolite ornamental oxide peat phosphate pigments polish 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 stones strata stratified structure subsoils substances sulphate sulphide sulphuric acid surface tellurium tertiary texture thickness tion tons usually varieties various vary veins volcanic yield zinc