A handy-book of rock namesHardwrike, 1873 - 139 páginas |
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Página 29
... felspar ( orthoclase ) , quartz , and mica . Black and white mica seem always to be present , but often in such minute flakes as to be only microsco- pically visible . Pyrite , and sometimes marca- site , are locally present ...
... felspar ( orthoclase ) , quartz , and mica . Black and white mica seem always to be present , but often in such minute flakes as to be only microsco- pically visible . Pyrite , and sometimes marca- site , are locally present ...
Página 30
... felspar , with dull or smooth con- choidal or fissile fracture ; colour yellowish , reddish , grey , greyish , or bluish , weathering white . " - Cotta . To the naked eye this rock does not appear to contain either mica or quartz ...
... felspar , with dull or smooth con- choidal or fissile fracture ; colour yellowish , reddish , grey , greyish , or bluish , weathering white . " - Cotta . To the naked eye this rock does not appear to contain either mica or quartz ...
Página 31
... felspar assumes a form resembling flowering - stalks . " - Cotta . - c . Plumose granite . The mica assumes a plu- mose form , like Prince of Wales's feathers . -Jukes . The granites belonging to this type [ intrusive granite ] in ...
... felspar assumes a form resembling flowering - stalks . " - Cotta . - c . Plumose granite . The mica assumes a plu- mose form , like Prince of Wales's feathers . -Jukes . The granites belonging to this type [ intrusive granite ] in ...
Página 33
... felspar + talc ) is a constituent of neither . Furthermore , in general chloritic granite can have no relation to protogene , not containing any talc . B. GRAPHITIC GRANITE . - With graphite in addition to mica . C. HEMATITIC OR ...
... felspar + talc ) is a constituent of neither . Furthermore , in general chloritic granite can have no relation to protogene , not containing any talc . B. GRAPHITIC GRANITE . - With graphite in addition to mica . C. HEMATITIC OR ...
Página 34
... felspars is porphyritically developed , when in general the mica does not curl round the large crystals of felspar , but the latter lie promiscuously about . a . Nodular Granite . - Containing round or semi- angular pieces or nodules of ...
... felspars is porphyritically developed , when in general the mica does not curl round the large crystals of felspar , but the latter lie promiscuously about . a . Nodular Granite . - Containing round or semi- angular pieces or nodules of ...
Otras ediciones - Ver todas
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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