A Guide to the Determination of Rocks: Being an Introduction to Lithology |
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Page 11
... easily discovered without a study made " in place . " Thus , one has constantly to distinguish granite from gneiss ; and it is very difficult to tell in what these two rocks differ in certain cases . Without knowing precisely the origin ...
... easily discovered without a study made " in place . " Thus , one has constantly to distinguish granite from gneiss ; and it is very difficult to tell in what these two rocks differ in certain cases . Without knowing precisely the origin ...
Page 13
... easily recognized , such as the color of the rock , when it is constant in the group and is not found the same in neighboring groups ; or such as the crystalline aspect , or earthy character , and fusibility before the blow - pipe . I ...
... easily recognized , such as the color of the rock , when it is constant in the group and is not found the same in neighboring groups ; or such as the crystalline aspect , or earthy character , and fusibility before the blow - pipe . I ...
Page 18
... with materials of uniform thickness but of different nature , shine under these conditions , with different colors which serve to distinguish them one from the other . Small irregular grains of quartz are easily 18 DETERMINATION OF ROCKS .
... with materials of uniform thickness but of different nature , shine under these conditions , with different colors which serve to distinguish them one from the other . Small irregular grains of quartz are easily 18 DETERMINATION OF ROCKS .
Page 19
... easily recog- nized by this means , either in sandstone , where it is almost the only mineral , or in granite or porphyry where it is associated with Feldspar . Moreover , the color exhibited by a crystal belonging to any other than the ...
... easily recog- nized by this means , either in sandstone , where it is almost the only mineral , or in granite or porphyry where it is associated with Feldspar . Moreover , the color exhibited by a crystal belonging to any other than the ...
Page 21
... easily fusible . Five different Feldspars with well - determined characteristics , are known : Orthoclase , in which potassa predominates ; Albite , in which soda predominates ; Anorthite , having a base of calcium or lime ; and two or ...
... easily fusible . Five different Feldspars with well - determined characteristics , are known : Orthoclase , in which potassa predominates ; Albite , in which soda predominates ; Anorthite , having a base of calcium or lime ; and two or ...
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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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