A Guide to the Determination of Rocks: Being an Introduction to Lithology |
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Page 15
... glass plate more or less inclined ; finally , examine by the microscope the isolated particles , comparing them with the ordinary elements of rocks brought to the same degree of fine- ness , subjecting them also to the action of acids ...
... glass plate more or less inclined ; finally , examine by the microscope the isolated particles , comparing them with the ordinary elements of rocks brought to the same degree of fine- ness , subjecting them also to the action of acids ...
Page 16
... glass . Such examination serves often to make known , either by their form or their color , the microscopic elements of basaltic or adelogenic rocks . It permits , also , the study of the minutest details of the mineral structure of ...
... glass . Such examination serves often to make known , either by their form or their color , the microscopic elements of basaltic or adelogenic rocks . It permits , also , the study of the minutest details of the mineral structure of ...
Page 24
... glass , coloring the flame yellow . It is readily attacked by acids . Oligoclase contains about 80 % of Silica . Andesine ( Oligoclase , very rich in Lime ) .- Oligoclase is generally accompanied , in the rocks , by silicates of ...
... glass , coloring the flame yellow . It is readily attacked by acids . Oligoclase contains about 80 % of Silica . Andesine ( Oligoclase , very rich in Lime ) .- Oligoclase is generally accompanied , in the rocks , by silicates of ...
Page 25
... glass ; is soluble in acids with a gelatinous deposit of Silica . Elæolite . - Possesses external — P b b P M M M Fig . 5 . characters slightly different from those of Nepheline . Has a greasy lustre in the fracture , tending to pearly ...
... glass ; is soluble in acids with a gelatinous deposit of Silica . Elæolite . - Possesses external — P b b P M M M Fig . 5 . characters slightly different from those of Nepheline . Has a greasy lustre in the fracture , tending to pearly ...
Page 26
... glass ; dissolv- ing to a gelatinous mass in acids . Hardness 5.5 . Specific gravity 2.29 . Form : dodecahedron , generally elongated in the direction of one of the octahedral axes . Cleavages par- allel to the faces of the dodecahedron ...
... glass ; dissolv- ing to a gelatinous mass in acids . Hardness 5.5 . Specific gravity 2.29 . Form : dodecahedron , generally elongated in the direction of one of the octahedral axes . Cleavages par- allel to the faces of the dodecahedron ...
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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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