A handy-book of rock namesHardwrike, 1873 - 139 páginas |
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Página 26
... sometimes to such an extent that the mica is only microscopically visible . Granite usually is a quaternary or quinary aggre- gate , containing , along with quartz , one or two fel- spars and one or two micas ; nevertheless , other ...
... sometimes to such an extent that the mica is only microscopically visible . Granite usually is a quaternary or quinary aggre- gate , containing , along with quartz , one or two fel- spars and one or two micas ; nevertheless , other ...
Página 29
... sometimes marca- site , are locally present . * Granityte occurs as veins in granite from mere lines to two or more yards in thickness . It seems to be allied to elvanyte or quartz - porphyry , hereafter described , as sometimes part of ...
... sometimes marca- site , are locally present . * Granityte occurs as veins in granite from mere lines to two or more yards in thickness . It seems to be allied to elvanyte or quartz - porphyry , hereafter described , as sometimes part of ...
Página 30
... Sometimes , indeed , there is felspar developed , but so sparingly and at such wide intervals , that it seems to be more an accessory than an essential of the rock . In some places even the mica seems to be absent , or in such minute ...
... Sometimes , indeed , there is felspar developed , but so sparingly and at such wide intervals , that it seems to be more an accessory than an essential of the rock . In some places even the mica seems to be absent , or in such minute ...
Página 31
... sometimes appears in large , well- marked veins , but more frequently it occurs in irregular veins , patches , and lentils , dying out in every direction . The dark - coloured mica , although the other constituents may be very coarsely ...
... sometimes appears in large , well- marked veins , but more frequently it occurs in irregular veins , patches , and lentils , dying out in every direction . The dark - coloured mica , although the other constituents may be very coarsely ...
Página 33
... sometimes occurs , and this variety has been called Furbogh Granite , from a district in the county Galway , Ireland . In places ripidolite , talc , or epidote may be present with , or in place of , the amphibole , making vari- eties ...
... sometimes occurs , and this variety has been called Furbogh Granite , from a district in the county Galway , Ireland . In places ripidolite , talc , or epidote may be present with , or in place of , the amphibole , making vari- eties ...
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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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