The Encyclopaedia Britannica: A Dictionary of Arts, Sciences and General Literature, 10. köideA. et C. Black, 1879 - 856 pages |
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Page 227
... rocks . A mineral may be classified as an inorganic body distinguished by a more or less definite chemical ... igneous rocks , as well as of sandstone and numerous aqueous rocks . The non - crys- tallized or colloid quartz is chiefly met ...
... rocks . A mineral may be classified as an inorganic body distinguished by a more or less definite chemical ... igneous rocks , as well as of sandstone and numerous aqueous rocks . The non - crys- tallized or colloid quartz is chiefly met ...
Page 228
... rocks as a result of the alteration of horn- blende , augite , or other anhydrous magnesian silicate . Delessite and ... igneous rocks . By their decay they form clay , and in that condition enter largely into the composition of the ...
... rocks as a result of the alteration of horn- blende , augite , or other anhydrous magnesian silicate . Delessite and ... igneous rocks . By their decay they form clay , and in that condition enter largely into the composition of the ...
Page 229
... rocks , also massive and earthy in beds , and sometimes in minute scales ( rubin - glimmer ) disseminated through ... igneous fusion , it is not altogether peculiar to them . It may be produced by chemical deposit from aqueous solutions , or ...
... rocks , also massive and earthy in beds , and sometimes in minute scales ( rubin - glimmer ) disseminated through ... igneous fusion , it is not altogether peculiar to them . It may be produced by chemical deposit from aqueous solutions , or ...
Page 230
... igneous and some metamorphic rocks . In some cases it exists in such development as powerfully to affect the magnetic needle , so that observations with that instrument among rocks of this character are deceptive . But even when much ...
... igneous and some metamorphic rocks . In some cases it exists in such development as powerfully to affect the magnetic needle , so that observations with that instrument among rocks of this character are deceptive . But even when much ...
Page 231
... Rocks really formed of compacted sediment become sometimes so close - grained that their origin may not be apparent ... igneous and sedimentary rocks . Thus they have often a distinctly granular structure , resembling that of sedimentary ...
... Rocks really formed of compacted sediment become sometimes so close - grained that their origin may not be apparent ... igneous and sedimentary rocks . Thus they have often a distinctly granular structure , resembling that of sedimentary ...
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abundant acid ancient angle appear augite axis basalt beds carbonic carbonic acid centre century character chemical coal coast cone consists contains crust crystalline crystals deposit distance district earth equator eruption existence feet felspar formations fossils Gaelic Galatia gallic acid galls galvanometer Gaur gelatin gems geological globe gneiss granite Greek heat hornblende igneous igneous rocks important iron islands known lake land latitude lava less lime limestone longitude mass materials matter meridian metamorphic miles mineral mountain observed obtained occur ocean organic original orthoclase parallel Paris passing period plane porphyritic portion present pressure produced quartz regions remains rise river rocks Roman round sand sandstone schists Scotland sediment shales side siliceous Silurian sometimes species specific gravity square miles stones strata stream structure substance surface temperature thick tion town traced upper vapour vertical volcanic voyage whole