A Guide to the Determination of Rocks: Being an Introduction to Lithology |
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Page 8
... The eruptive rocks have their base in the profound depths of the globe , and connect it , at least at the epoch of their consolidation , to the concentric envelopes of the interior nucleus , which have been added 8 DETERMINATION OF ROCKS .
... The eruptive rocks have their base in the profound depths of the globe , and connect it , at least at the epoch of their consolidation , to the concentric envelopes of the interior nucleus , which have been added 8 DETERMINATION OF ROCKS .
Page 17
... base- ( Sulphur , Topaz , Staurotide , Andalusite , Mica , Mesotype , Stilbite , Peridot , Arra- gonite , Cerusite ... base may be a rhombus , to the two diagonals of this base . If the object is slightly displaced , so that one of these ...
... base- ( Sulphur , Topaz , Staurotide , Andalusite , Mica , Mesotype , Stilbite , Peridot , Arra- gonite , Cerusite ... base may be a rhombus , to the two diagonals of this base . If the object is slightly displaced , so that one of these ...
Page 18
... base , is perpendicular to the line of greatest in- clination . The two others are found to bear different degrees of obliquity to the crystallographic lines . The minerals of this system , widely diffused among the rocks , are ...
... base , is perpendicular to the line of greatest in- clination . The two others are found to bear different degrees of obliquity to the crystallographic lines . The minerals of this system , widely diffused among the rocks , are ...
Page 21
... base of soda and lime ; and Labradorite , having a base of lime with a smaller proportion of soda . Orthoclase ( Aluminum potassium silicates ) .- Form : an oblique prism with a rhombic base , mod- ified generally upon the lateral faces ...
... base of soda and lime ; and Labradorite , having a base of lime with a smaller proportion of soda . Orthoclase ( Aluminum potassium silicates ) .- Form : an oblique prism with a rhombic base , mod- ified generally upon the lateral faces ...
Page 22
... bases ( and inclined 45 ° 3 ' to the vertical axis ) , so that the two bases P become adjacent to each other , also ... base only is ob- tained ; the reflection from the cleavage of the other portion is obtained only by turning the rock ...
... bases ( and inclined 45 ° 3 ' to the vertical axis ) , so that the two bases P become adjacent to each other , also ... base only is ob- tained ; the reflection from the cleavage of the other portion is obtained only by turning the rock ...
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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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