A Guide to the Determination of Rocks: Being an Introduction to Lithology |
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Page 28
... distinguished from the pre- ceding . They are decomposed by the aid of concentrated hydro- chloric acid after a prolonged boiling ; more easily by sulphuric acid . Finally we have the Pennines , having optical form and pro- perties of ...
... distinguished from the pre- ceding . They are decomposed by the aid of concentrated hydro- chloric acid after a prolonged boiling ; more easily by sulphuric acid . Finally we have the Pennines , having optical form and pro- perties of ...
Page 33
... distinguished by a lively red - brown color with a coppery lustre on the cleavage - face ; it fuses to an opaque greenish - gray glass . Diaclasite . Bronzite slightly hydrated , yellowish or greenish - gray ; hardness , 3. 5 ; fuses ...
... distinguished by a lively red - brown color with a coppery lustre on the cleavage - face ; it fuses to an opaque greenish - gray glass . Diaclasite . Bronzite slightly hydrated , yellowish or greenish - gray ; hardness , 3. 5 ; fuses ...
Page 42
... distinguished from Granite by its schis- toide texture . Quartz , quite difficult to distinguish in some varie- ties , is , nevertheless , found in small grains , grayish in color , and somewhat worn ; Feldspar , associated with it ...
... distinguished from Granite by its schis- toide texture . Quartz , quite difficult to distinguish in some varie- ties , is , nevertheless , found in small grains , grayish in color , and somewhat worn ; Feldspar , associated with it ...
Page 44
... so numerous that they are not easily distinguished from the paste or matrix . The latter is often colored green by Chlorite , with which it is intimately mixed . It often includes Hornblende , also ,. 44 DETERMINATION OF ROCKS .
... so numerous that they are not easily distinguished from the paste or matrix . The latter is often colored green by Chlorite , with which it is intimately mixed . It often includes Hornblende , also ,. 44 DETERMINATION OF ROCKS .
Page 45
... distinguished with a low magnifying power . Porphyries form mountains of a savage aspect , with steep sides and ragged crests , often bris- tling with sharp pinnacles . Varieties of structure and texture : Quartziferous Porphyries ...
... distinguished with a low magnifying power . Porphyries form mountains of a savage aspect , with steep sides and ragged crests , often bris- tling with sharp pinnacles . Varieties of structure and texture : Quartziferous Porphyries ...
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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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