A Guide to the Determination of Rocks: Being an Introduction to Lithology |
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Page 48
... Trachytes . The following may be found in the Trachytes as accessory minerals : Oligoclase Hornblende , in short prisms and brilliant black crystals ; brown or black Mica in hexagonal lamina ( Micaceous Trachyte ) ; Magnetic Iron , or ...
... Trachytes . The following may be found in the Trachytes as accessory minerals : Oligoclase Hornblende , in short prisms and brilliant black crystals ; brown or black Mica in hexagonal lamina ( Micaceous Trachyte ) ; Magnetic Iron , or ...
Page 49
... Trachytes ; Spherulitic Trachytes , the paste of which is full of minute cavities ; Brecciated Trachytes composed of an . gular pieces of this rock , of different colors , in a paste of the same nature . 26. Sanidophyres , or Trachytic ...
... Trachytes ; Spherulitic Trachytes , the paste of which is full of minute cavities ; Brecciated Trachytes composed of an . gular pieces of this rock , of different colors , in a paste of the same nature . 26. Sanidophyres , or Trachytic ...
Page 50
... Trachytic Cinders . ( Syn . Spodite , Cordier ) .— These are formed from the disaggregation of the Trachytes , and mat- ter projected from volcanoes at the time of the eruptions of Trachyte or Phonolites ( Cascade of Mont Dore ) . 28 ...
... Trachytic Cinders . ( Syn . Spodite , Cordier ) .— These are formed from the disaggregation of the Trachytes , and mat- ter projected from volcanoes at the time of the eruptions of Trachyte or Phonolites ( Cascade of Mont Dore ) . 28 ...
Page 51
... Trachytes of the Andes ; Peak of Teneriffe ; Hecla , in Iceland . Andesites exhibit the same characteristics of development as Trachytes . They are divided sometimes , into enormous many- sided pillars . In the Andes they form large ...
... Trachytes of the Andes ; Peak of Teneriffe ; Hecla , in Iceland . Andesites exhibit the same characteristics of development as Trachytes . They are divided sometimes , into enormous many- sided pillars . In the Andes they form large ...
Page 52
... Trachytes , but the peaks are more isolated , and at the same time more durable and sharper . They often traverse the Trachytes . 30. Obsidian . - This is a Trachyte in a vitreous state , and has a high degree of lustre , a conchoidal ...
... Trachytes , but the peaks are more isolated , and at the same time more durable and sharper . They often traverse the Trachytes . 30. Obsidian . - This is a Trachyte in a vitreous state , and has a high degree of lustre , a conchoidal ...
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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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