Economic Geology: Or, Geology in Its Relations to the Arts and ManufacturesW. Blackwood and sons, 1874 - 336 páginas |
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Página xiii
... SILICA - ALUMINA Group , Topaz . Emerald , Beryl . Lapis Lazuli . Moonstone , Labradorite . Garnets , Pyrope , Almandine , Carbuncle . 236 237 240 240 259 263 264 268 271 4. THE SILICA GROUP , Rock - Crystal , Amethyst CONTENTS . xiii.
... SILICA - ALUMINA Group , Topaz . Emerald , Beryl . Lapis Lazuli . Moonstone , Labradorite . Garnets , Pyrope , Almandine , Carbuncle . 236 237 240 240 259 263 264 268 271 4. THE SILICA GROUP , Rock - Crystal , Amethyst CONTENTS . xiii.
Página xiv
... SILICA GROUP , Rock - Crystal , Amethyst , Cairngorm , & c . Calcedony , Agate , Carnelian , Onyx , & c . Opal . Jasper , Jade , Menilite , & c . 5. MISCELLANEOUS GROUP , Malachite . 6. PASTES OR ARTIFICIAL GEMS , XVIII . THE METALS AND ...
... SILICA GROUP , Rock - Crystal , Amethyst , Cairngorm , & c . Calcedony , Agate , Carnelian , Onyx , & c . Opal . Jasper , Jade , Menilite , & c . 5. MISCELLANEOUS GROUP , Malachite . 6. PASTES OR ARTIFICIAL GEMS , XVIII . THE METALS AND ...
Página 20
... silica ; rock - crystal is the name given to clear , transparent , crystallised varieties ; and coloured varieties are known as amethyst , cairngorm , topaz , & c . Quartz - rock is massive quartz of various colours , and occurs in ...
... silica ; rock - crystal is the name given to clear , transparent , crystallised varieties ; and coloured varieties are known as amethyst , cairngorm , topaz , & c . Quartz - rock is massive quartz of various colours , and occurs in ...
Página 21
... silica , alumina , and potash or soda ) is a softer mineral than quartz . The larger and softer crystals occurring in granite are of felspar ; they can be scratched by the knife when quartz resists it , and can also be distinguished by ...
... silica , alumina , and potash or soda ) is a softer mineral than quartz . The larger and softer crystals occurring in granite are of felspar ; they can be scratched by the knife when quartz resists it , and can also be distinguished by ...
Página 35
... silica , alumina , and lime , with varying proportions of soda , potash , and iron ; its fertility and mellowness being augmented by its colour , which absorbs the sun's heat , and by the fissured structure of the rocks beneath , which ...
... silica , alumina , and lime , with varying proportions of soda , potash , and iron ; its fertility and mellowness being augmented by its colour , which absorbs the sun's heat , and by the fissured structure of the rocks beneath , which ...
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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