A Guide to the Determination of Rocks: Being an Introduction to Lithology |
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Page 25
... 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 on the exterior . Color varies from brown , to ...
... 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 on the exterior . Color varies from brown , to ...
Page 27
... deposit of Silica . Biotites ( Micas rich in magnesia ) . — Of a black or deep brown color , attacked by concentrated sulphuric acid , leaving a residue of pearly scales of Silica . One variety of this class is Rubellan , of a rose ...
... deposit of Silica . Biotites ( Micas rich in magnesia ) . — Of a black or deep brown color , attacked by concentrated sulphuric acid , leaving a residue of pearly scales of Silica . One variety of this class is Rubellan , of a rose ...
Page 59
... deposit between dikes of Basalt in the West Indies . 43. Nephelinites . - Rocks with a compact or granular tex- Gallinalool En Али ture - all having the appearance of Basalts and differing PYROXENIC AND HYPERSTHENIC ROCKS . 59.
... deposit between dikes of Basalt in the West Indies . 43. Nephelinites . - Rocks with a compact or granular tex- Gallinalool En Али ture - all having the appearance of Basalts and differing PYROXENIC AND HYPERSTHENIC ROCKS . 59.
Page 60
... deposit in hydrochloric acid which finally dissolves en- tirely . Varieties : N. Granular ; N. with fine grains ; N. compact ; N. with Amphigene ( passing to Amphigenites ) . A great number of the lavas of Lake Laach enclose in their ...
... deposit in hydrochloric acid which finally dissolves en- tirely . Varieties : N. Granular ; N. with fine grains ; N. compact ; N. with Amphigene ( passing to Amphigenites ) . A great number of the lavas of Lake Laach enclose in their ...
Page 70
... deposits upon the edges of the cavities . Durocher has found nearly 40 % of Epidote in a Dio- rite of Saint - Beat , Haute - Garonne . Accidental minerals : Cubic Pyrites , Magnetite , Chlorite , Sphene , Magnetic Pyrites , Mica ...
... deposits upon the edges of the cavities . Durocher has found nearly 40 % of Epidote in a Dio- rite of Saint - Beat , Haute - Garonne . Accidental minerals : Cubic Pyrites , Magnetite , Chlorite , Sphene , Magnetic Pyrites , Mica ...
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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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