Aids in Practical Geology |
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Page xii
... microscope and microscopic preparations , 123 XVL - The more prominent characters to be observed in minerals • in rock sections , XVII . — The characters of the chief rock - forming minerals in the rock - mass and in thin sections ...
... microscope and microscopic preparations , 123 XVL - The more prominent characters to be observed in minerals • in rock sections , XVII . — The characters of the chief rock - forming minerals in the rock - mass and in thin sections ...
Page xiii
Grenville Arthur James Cole. LIST OF ILLUSTRATIONS . FRONTISPIECE - MICROSCOPIC SECTIONS OF ROCKS . 1. Olivine ... microscope with rotating stage , 15 . 16. Support for condensing - lens , 38 39 • 44 80 82 83 114 by means of heavy ...
Grenville Arthur James Cole. LIST OF ILLUSTRATIONS . FRONTISPIECE - MICROSCOPIC SECTIONS OF ROCKS . 1. Olivine ... microscope with rotating stage , 15 . 16. Support for condensing - lens , 38 39 • 44 80 82 83 114 by means of heavy ...
Page 2
... microscope must be tested in a second or third excursion by re - examination of the relations of the rock - masses in the field . In the field itself broad names are assigned to objects , detailed determination being left for ...
... microscope must be tested in a second or third excursion by re - examination of the relations of the rock - masses in the field . In the field itself broad names are assigned to objects , detailed determination being left for ...
Page 3
... microscopic slide , amid such memories , seems to assume its place in nature . The instruments used in the field should be noticed here . First in importance is the hammer , which may vary much in size and weight with the work proposed ...
... microscopic slide , amid such memories , seems to assume its place in nature . The instruments used in the field should be noticed here . First in importance is the hammer , which may vary much in size and weight with the work proposed ...
Page 20
... microscope will often afford valuable evidence . The planes of cleavage are often marked out on the exposed surface of a crystal , as in hornblende , by traces of incipient decomposition . The use of the basal cleavage in observing the ...
... microscope will often afford valuable evidence . The planes of cleavage are often marked out on the exposed surface of a crystal , as in hornblende , by traces of incipient decomposition . The use of the basal cleavage in observing the ...
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Common terms and phrases
abundant acid altered amphibole andesites angle appear aragonite areas assay augite axis basal bead become biotite blue brown calcareous calcite carbonate Carboniferous cavities character cleavage cobalt colour colourless common commonly compact constituents Cretaceous crossed nicols crystalline crystals dark decomposed deposits developed Devonian elongated encrustation eurites felspar fibrous flame foliated forms fossils fragments garnet Geol glass Gotlandian grains granite granular granules green groundmass H Cl hinge-line hornblende igneous rocks iron Journ Jurassic lavas leucite limestones lithoidal magnetite margin marked mass mica microscope minerals minute nepheline occur olivine opaque ophitic optic ordinary Ordovician orthoclase oxide pale parallel Plagioclase planes plates pleochroism polarised porphyritic posterior powder prismatic prisms pyroxene quartz radial reaction Refr refractive resemble rhombic rhyolites schists sections seen septa serpentine shell silica soda sometimes specific gravity specimens spherulites spicules structure sulphur surface thick trace trachytic tube types typical umbo ventral
Popular passages
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