Rocks Classified and Described: A Treatise on LithologyLongmans, Green, and Company, 1866 - 425 páginas |
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Página 6
... beds of deposit . ( b ) Amethyst . - Violet , coloured by the oxide of manganese . ( c ) Chalcedony . - An intimate admixture of crystalline and amorphous silica . ( d ) Agate . - A variegated combination of common quartz , amethyst ...
... beds of deposit . ( b ) Amethyst . - Violet , coloured by the oxide of manganese . ( c ) Chalcedony . - An intimate admixture of crystalline and amorphous silica . ( d ) Agate . - A variegated combination of common quartz , amethyst ...
Página 8
... beds ( Ceylon , China ) . Emery forms separate masses of deposit in the talcose schist ( Naxos , Saxony ) . B. SILICATES . ( a ) FELSPAR SECTION . The felspars are , after quartz , the most important of all ingredients of rocks . We ...
... beds ( Ceylon , China ) . Emery forms separate masses of deposit in the talcose schist ( Naxos , Saxony ) . B. SILICATES . ( a ) FELSPAR SECTION . The felspars are , after quartz , the most important of all ingredients of rocks . We ...
Página 28
... beds of rock in the regions of crystalline schis sist almost exclusively of this mineral . Talc - mica protogine , and some sandstones contain it as an e ingredient . 27. Meerschaum . - Massive and in nodules . Fract conchoidal , and ...
... beds of rock in the regions of crystalline schis sist almost exclusively of this mineral . Talc - mica protogine , and some sandstones contain it as an e ingredient . 27. Meerschaum . - Massive and in nodules . Fract conchoidal , and ...
Página 43
... beds of iron - ore ( Arendal ) . 55. Orthite ( Allanite , Cerine ) .— Monoclinic , isomorphous with epidote , but seldom occurs in distinct crystals . More usually massive , in granular and short fibrous aggregates . Fracture conchoidal ...
... beds of iron - ore ( Arendal ) . 55. Orthite ( Allanite , Cerine ) .— Monoclinic , isomorphous with epidote , but seldom occurs in distinct crystals . More usually massive , in granular and short fibrous aggregates . Fracture conchoidal ...
Página 47
... beds of iron - ore ( with pyroxene in Arendal ) , finally in granular limestone ( in many localities in North America ) . 65. Volborthite . - Hexagonal . Crystals are small , often only scaly particles on an earthy incrustation . H. - 3 ...
... beds of iron - ore ( with pyroxene in Arendal ) , finally in granular limestone ( in many localities in North America ) . 65. Volborthite . - Hexagonal . Crystals are small , often only scaly particles on an earthy incrustation . H. - 3 ...
Outras edições - Ver tudo
Rocks Classified and Described: A Treatise on Lithology Bernhard von Cotta Visualização integral - 1878 |
Rocks Classified and Described: A Treatise on Lithology Bernhard von Cotta Visualização integral - 1866 |
Rocks Classified and Described: A Treatise on Lithology Bernhard von Cotta Visualização integral - 1865 |
Palavras e frases frequentes
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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