A Guide to the Determination of Rocks: Being an Introduction to Lithology |
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Page 10
... exhibits all its characters ; it is only there that we can study its position and relative age ; it is there ... exhibit their distinctive characters . It is also on the surface that it is necessary to follow these transitions , so ...
... exhibits all its characters ; it is only there that we can study its position and relative age ; it is there ... exhibit their distinctive characters . It is also on the surface that it is necessary to follow these transitions , so ...
Page 14
... exhibits plane or nearly plane surfaces ; sparry fracture exhibits surfaces made up of geometrical planes , as in the surfaces of crystals ; laminated fracture presents laminæ or thin plates of the mineral . This term is applied when ...
... exhibits plane or nearly plane surfaces ; sparry fracture exhibits surfaces made up of geometrical planes , as in the surfaces of crystals ; laminated fracture presents laminæ or thin plates of the mineral . This term is applied when ...
Page 17
... exhibit , in such cases , around their opti- cal axes , circular rings of brilliant colors , traversed by a dark cross , whose branches are parallel to the two sections of the Nicol . For explanation of this phenomenon , we refer the ...
... exhibit , in such cases , around their opti- cal axes , circular rings of brilliant colors , traversed by a dark cross , whose branches are parallel to the two sections of the Nicol . For explanation of this phenomenon , we refer the ...
Page 21
... elongat- ed , also , in the direction of their bases ( Fig . 2 ) . The crystals exhibit many different modes of grouping , the principal of which are the following : ( 1 ) coupled in 8 P 91 M Fig . 1 . Σ 117 M P g Fig . 2 . d. PART FIRST.
... elongat- ed , also , in the direction of their bases ( Fig . 2 ) . The crystals exhibit many different modes of grouping , the principal of which are the following : ( 1 ) coupled in 8 P 91 M Fig . 1 . Σ 117 M P g Fig . 2 . d. PART FIRST.
Page 22
... exhibit the faces p and g1 , and a face h1 with very unequal fractures . Fig . 3 . Colors : white , reddish - white , gray , green , bluish - green . Powder grayish - white . Lustre : vitreous ; sometimes pearly upon the cleavage faces ...
... exhibit the faces p and g1 , and a face h1 with very unequal fractures . Fig . 3 . Colors : white , reddish - white , gray , green , bluish - green . Powder grayish - white . Lustre : vitreous ; sometimes pearly upon the cleavage faces ...
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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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