Class-book of GeologyMacmillan and Company, 1890 - 516 páginas |
Dentro del libro
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Página xvi
... Calcite ( Iceland spar ) , showing its characteristic rhombohedral cleavage 124 46. Cube , octahedron , dodecahedron ... Calcite in the form of " nail - head spar 133 134 FIG . 60. Calcite in the form of dog - xvi LIST OF ILLUSTRATIONS.
... Calcite ( Iceland spar ) , showing its characteristic rhombohedral cleavage 124 46. Cube , octahedron , dodecahedron ... Calcite in the form of " nail - head spar 133 134 FIG . 60. Calcite in the form of dog - xvi LIST OF ILLUSTRATIONS.
Página xvii
Archibald Geikie. FIG . 60. Calcite in the form of dog - tooth spar • 61. Sphærosiderite or Clay - ironstone concretion enclosing portion of a fern 62. Gypsum crystals PAGE 135 63. Group of fluor - spar crystals 64. Concretions 65 ...
Archibald Geikie. FIG . 60. Calcite in the form of dog - tooth spar • 61. Sphærosiderite or Clay - ironstone concretion enclosing portion of a fern 62. Gypsum crystals PAGE 135 63. Group of fluor - spar crystals 64. Concretions 65 ...
Página 109
... were poured , and the abundant dykes which no doubt served as the channels wherein. FIG . 43. - Volcanic dykes rising through the bedded tuff of a crater . FIG . 45. — Calcite ( Iceland spar ) ,. IX 109 LAVA - FLOODS AND DYKES.
... were poured , and the abundant dykes which no doubt served as the channels wherein. FIG . 43. - Volcanic dykes rising through the bedded tuff of a crater . FIG . 45. — Calcite ( Iceland spar ) ,. IX 109 LAVA - FLOODS AND DYKES.
Página 124
... calcite , of breaking along definite crystalline planes , is termed cleavage. FIG . 45. — Calcite ( Iceland spar ) , showing its characteristic rhombohedral cleavage . crystalline quartz ( Fig . 52 ) . The dark. 124 СНАР . IMPORTANT ...
... calcite , of breaking along definite crystalline planes , is termed cleavage. FIG . 45. — Calcite ( Iceland spar ) , showing its characteristic rhombohedral cleavage . crystalline quartz ( Fig . 52 ) . The dark. 124 СНАР . IMPORTANT ...
Página 125
... calcite , that the crystallised mineral can hardly be broken , except along the planes that define the rhombohedron . Many minerals cleave more or less easily in one or more directions , and break irregularly in others . The cleavage ...
... calcite , that the crystallised mineral can hardly be broken , except along the planes that define the rhombohedron . Many minerals cleave more or less easily in one or more directions , and break irregularly in others . The cleavage ...
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Términos y frases comunes
abundant accumulated acid Ammonites ancient Assistant Master beds BOOK bottom Brachiopods calcareous calcite Cambrian Cambridge carbonate of lime Carboniferous Chapter chiefly clay College containing corals Cretaceous crinoids crystalline crystals decay deposits detritus Devonian earth earth's crust Edited ELEMENTARY Eocene eruptive Europe evidence example extinct fauna Fcap feet fissures fossils genera GEOGRAPHY geological history glacier globe gradually granite gravel GREEK ground Illustrated Jurassic kinds known lakes land lava layers limestone living lower marine marls mass materials Mesozoic mineral Miocene mountains natural occur Old Red Sandstone organic remains original Palæozoic Paleozoic period Permian plants and animals Pliocene present preserved Prof Professor quartz Red Sandstone regions revised rivers rocks sand schists sediment sedimentary sedimentary rocks shales sheets shells siliceous Silurian soil solid sometimes species stone strata structure substance surface terrestrial Tertiary thick trace Triassic upper various vegetation volcanic
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