A handy-book of rock namesHardwrike, 1873 - 139 páginas |
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Página 26
... weather with a peculiar rough , rugged aspect . * In Cornwall granite formerly was called growan , from gronen , a grain . Some of the granites that weather or disintegrate freely appear to have marcasite as an ingredient disseminated ...
... weather with a peculiar rough , rugged aspect . * In Cornwall granite formerly was called growan , from gronen , a grain . Some of the granites that weather or disintegrate freely appear to have marcasite as an ingredient disseminated ...
Página 35
... weather neither like a true granite nor yet like a felstone , having a characteristic weathering of their own , partaking of the nature of both . Granitic felstones probably are metamorphosed felstones . They are often banded , the ...
... weather neither like a true granite nor yet like a felstone , having a characteristic weathering of their own , partaking of the nature of both . Granitic felstones probably are metamorphosed felstones . They are often banded , the ...
Página 40
... weather with the even flow- ing surface so characteristic of the Felstones , and not with the rough rugged aspect of granite . They often near the edge of large masses , at the walls of dykes , and in small branch dykes or veins merge ...
... weather with the even flow- ing surface so characteristic of the Felstones , and not with the rough rugged aspect of granite . They often near the edge of large masses , at the walls of dykes , and in small branch dykes or veins merge ...
Página 43
... weather more like a felstone than like a granite ; some , however , do not . At the walls of dykes or masses they often merge into a more or less compact rock- " The Mother - rock , or Base , " of Cotta . Granitoid elvan- yte seems to ...
... weather more like a felstone than like a granite ; some , however , do not . At the walls of dykes or masses they often merge into a more or less compact rock- " The Mother - rock , or Base , " of Cotta . Granitoid elvan- yte seems to ...
Página 44
... weather in flowing surfaces with even outlines . They are , however , affected by different structures . Some are homogeneous ; in some there is a platy arrange- ment , rudely parallel to the walls of the dykes 44 HANDY - BOOK OF ROCK ...
... weather in flowing surfaces with even outlines . They are , however , affected by different structures . Some are homogeneous ; in some there is a platy arrange- ment , rudely parallel to the walls of the dykes 44 HANDY - BOOK OF ROCK ...
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Términos y frases comunes
aggregate amphibole Arenaceous argillaceous Argillous Augyte beds bituminous British Calcareous carbonaceous Chloritic classed clay cloth coal colour compact concretionary Conglomeritic contains Cotta Crown 8vo crystalline crystals Demy 8vo deposited derivate rocks Dolomitic drift dykes elvanyte Euryte F.R.S. Illustrated Fcap felsitic felspar felspathic felstone Ferruginous fissile foliation formed gneiss Gneissoid granite granitoid granular Grass grit Hematitic highly siliceous Hornblendic igneous rocks Illus Ingenite intrusive Ireland Jukes labradorite lamination Lankester layers less Lignyte limestone marcasite mass matrix metamorphic metamorphosed mica micaceous Microscopic minerals occur oligoclase oligoclase granite Ophyte orthoclase Plants plates Plutonic Popular Science Review porphyritic Prof pyrite pyroxene quartz Quartzose Quartzyte R. A. Proctor Ribaned ripidolite sand sandstone schist schistose Sedges sedimentary rocks shale siliceous slate sometimes Sowerby's English Botany spheroidal steatyte stone Structural Varieties Subgroup Subvar Subvarieties surface Syenyte texture Trachyte tuff Tuffose Turf usually Varieties in Composition veins Vesicular Volcanic weather Whinstone
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