Rocks Classified and Described: A Treatise on LithologyLongmans, Green, and Company, 1866 - 425 páginas |
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Página xi
... Volcanic Basaltic Rocks ( 2 ) Plutonic Greenstones Porphyrite Group Mica Trap Rocks Syenite Group Acidic Igneous Rocks ( 1 ) Volcanic Trachyte Group PAGE 123 127 131 131 • 132 144 • 145 · · 168 · 173 . 176 182 · 182 · 183 · 198 201 201 ...
... Volcanic Basaltic Rocks ( 2 ) Plutonic Greenstones Porphyrite Group Mica Trap Rocks Syenite Group Acidic Igneous Rocks ( 1 ) Volcanic Trachyte Group PAGE 123 127 131 131 • 132 144 • 145 · · 168 · 173 . 176 182 · 182 · 183 · 198 201 201 ...
Página 6
... volcanic rocks ( in Iceland , Faroe Islands , the Brazils , & c . ) , or in metallic veins ( e.g. in Saxony ) . ] ( e ) Jasper . - Very frequently in globular masses ( ball - jasper ) coloured red by the peroxide of iron ; found in the ...
... volcanic rocks ( in Iceland , Faroe Islands , the Brazils , & c . ) , or in metallic veins ( e.g. in Saxony ) . ] ( e ) Jasper . - Very frequently in globular masses ( ball - jasper ) coloured red by the peroxide of iron ; found in the ...
Página 8
... volcanic rocks , or cloth- ing the surfaces of clefts in the same rocks . In these and similar cases the opal is a product of exfiltration from the rock in or near which it occurs . Thus , the precious opal found in the trachytic rocks ...
... volcanic rocks , or cloth- ing the surfaces of clefts in the same rocks . In these and similar cases the opal is a product of exfiltration from the rock in or near which it occurs . Thus , the precious opal found in the trachytic rocks ...
Página 10
... volcanic rocks , and only occurs in these . Thus it is found in phonolites , trachytes , pitchstones , obsidian , and lavas . Sometimes it occurs porphyritically in large tabular crystals , as in the trachyte of Dra- chenfels ...
... volcanic rocks , and only occurs in these . Thus it is found in phonolites , trachytes , pitchstones , obsidian , and lavas . Sometimes it occurs porphyritically in large tabular crystals , as in the trachyte of Dra- chenfels ...
Página 14
... volcanic ( or plutonic ) rocks , in which they occur as essential constituents . They are , there- fore , almost always , if not always , igneous products . We do not , however , mean to dispute the possibility of some having arisen by ...
... volcanic ( or plutonic ) rocks , in which they occur as essential constituents . They are , there- fore , almost always , if not always , igneous products . We do not , however , mean to dispute the possibility of some having arisen by ...
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Términos y frases comunes
aggregates Alps amygdaloidal aphanite appear argillaceous augite basalt beds bitumen brown Browncoal calcareous calcspar carbonate character chemical chlorite clay clay-slate Cleavage coal colour Colourless columnar compact composition compound conchoidal to uneven consists contains Crown 8vo crystalline schists crystals decomposed deposits diabase diorite dolerite dolomite earth Edition felsitic felspar fibrous fine-grained foliated formation fossils Fracture conchoidal frequently fuses garnet geodes geol geological Germ gneiss grains granite granular grav greenstones grey gypsum hornblende igneous rocks imbedded iron Jahrb labradorite lavas leucite lime limestone Lustre vitreous magnesia magnetic iron-ore marl mass massive matrass matrix melaphyre metamorphic mica mica-schist mineral muriatic acid occurs oligoclase opaque origin orthoclase oxide plutonic porphyritic pyrites pyroxene quartz quartz-porphyry resinous rock-salt sandstone Saxony schists sedimentary rocks serpentine shale silica slaty soluble sometimes strata sulphuric surface syenite texture trachyte transition translucent transmutation Transparent tufa usually varieties veins vesicular cavities volcanic Woodcuts
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