A Guide to the Determination of Rocks: Being an Introduction to Lithology |
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Page 7
... layers , are regarded as being among those which resulted from the slow cooling of the incandescent globe . Many geologists add also certain fine - grained granites . Rocks of such origin are called primitive . A Immediately that the ...
... layers , are regarded as being among those which resulted from the slow cooling of the incandescent globe . Many geologists add also certain fine - grained granites . Rocks of such origin are called primitive . A Immediately that the ...
Page 8
... layers . There is a thirc , origin of rocks also very important . From the earliest epochs , there have been produced great rents in the earth's crust , into which have been injected , in a more or less pasty condition , the rocks ...
... layers . There is a thirc , origin of rocks also very important . From the earliest epochs , there have been produced great rents in the earth's crust , into which have been injected , in a more or less pasty condition , the rocks ...
Page 11
... layers . Granite and gneiss have no more the same geological character . But granite has somewhat of the texture of gneiss , as if to show better the affinity of these two species of rock . Because of their different origins - betrayed ...
... layers . Granite and gneiss have no more the same geological character . But granite has somewhat of the texture of gneiss , as if to show better the affinity of these two species of rock . Because of their different origins - betrayed ...
Page 42
... layers , plane or contorted or even folded in zig- zags . Notwithstanding this structure , the rock is not easily split into parallel layers . It is not easy to distinguish , mineralogic- ally , Gneiss from schistose Granite ; but ...
... layers , plane or contorted or even folded in zig- zags . Notwithstanding this structure , the rock is not easily split into parallel layers . It is not easy to distinguish , mineralogic- ally , Gneiss from schistose Granite ; but ...
Page 50
... layers of older rocks . They also fill the irregular fissures in the rocks under the form of dikes and veins . They exhibit some- times a prismatic division analogous to that of the Porphyries . They exhibit themselves in layers on the ...
... layers of older rocks . They also fill the irregular fissures in the rocks under the form of dikes and veins . They exhibit some- times a prismatic division analogous to that of the Porphyries . They exhibit themselves in layers on the ...
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Common terms and phrases
Accessory elements Accidental minerals Alumina Amphibole argillaceous attacked by acids Augite Basalts blackish blow-pipe Breccia brown Calc-spar Calcite Calcium carbon cavities cement Chlorite clay cleavage closed tube Cloth colorless compact conchoidal fracture contains crystalline crystals Delesse density Diorite Dolomite earthy easily Edition effervescence enamel Engineers Epidote Eurite exhibits Feldspar fibrous fragments fuses fusible Garnet globule globuliferous Gneiss grains granite granular gray grayish greasy lustre greenish hardness heated hexagonal Hornblende hydrochloric acid Illustrated Infantry infusible insoluble Labradorite laminæ layers less Lime Limestone Magnesia magnetic Magnetite Marl masses Melaphyres Mica Mica Schist Military Naval Oligoclase Oolitic Ordnance Orthoclase oxide of Iron paste pearly Phonolite plates porous Porphyry powder prisms Pumice Pyrites Pyroxene Quartz reddish rhombic base rock sandstone Schist schistose scoriaceous Silica slates sometimes steel point sulphuric acid Talc texture Tourmaline Trachytes TREATISE U. S. Army U. S. Navy varieties vitreous yellow yellowish yields
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