A Guide to the Determination of Rocks: Being an Introduction to Lithology |
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Page 14
... fracture are described by the follow- ing terms : Vitreous fracture yields unequal surface ; conchoidal fracture produces a curved or shell - like surface ; splintery frac- ture presents a surface like that of broken wood ; platy fracture ...
... fracture are described by the follow- ing terms : Vitreous fracture yields unequal surface ; conchoidal fracture produces a curved or shell - like surface ; splintery frac- ture presents a surface like that of broken wood ; platy fracture ...
Page 18
... fracture in one of these substances , and the position of the regular lines which limit the contour , it is sometimes useful to measure the angle of the direction which allows the obscurity to remain when it is parallel to one of the ...
... fracture in one of these substances , and the position of the regular lines which limit the contour , it is sometimes useful to measure the angle of the direction which allows the obscurity to remain when it is parallel to one of the ...
Page 22
... fractures . Fig . 3 . Colors : white , reddish - white , gray , green , bluish - green . Powder grayish - white . Lustre : vitreous ; sometimes pearly upon the cleavage faces ; all degrees of transparency . Hard- ness 6. Specific ...
... fractures . Fig . 3 . Colors : white , reddish - white , gray , green , bluish - green . Powder grayish - white . Lustre : vitreous ; sometimes pearly upon the cleavage faces ; all degrees of transparency . Hard- ness 6. Specific ...
Page 23
... fracture , its hardness and its fusibility before the blow - pipe . In order to observe this latter characteristic , it is necessary to break it into as small fragments as possible ; then choose from among them those which have the ...
... fracture , its hardness and its fusibility before the blow - pipe . In order to observe this latter characteristic , it is necessary to break it into as small fragments as possible ; then choose from among them those which have the ...
Page 25
... fracture , tending to pearly on the exterior . Color varies from brown , to green or red . Fig . 6 . 2 2. Amphigene or Leucite ( Aluminic - potassic Silicate ) . Form : trapezohedron of the cubic system ( Fig . 6 ) . Possess- es a ...
... fracture , tending to pearly on the exterior . Color varies from brown , to green or red . Fig . 6 . 2 2. Amphigene or Leucite ( Aluminic - potassic Silicate ) . Form : trapezohedron of the cubic system ( Fig . 6 ) . Possess- es a ...
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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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