A Handy-book of Rock Names, with Brief Descriptions of the Rocks |
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Page 27
... veins of segregation , which in the gra- nites generally form two distinct varieties . One kind appears as irregular veins , nests , or patches , that have no deep - seated source , but die out every way , often in very short distances ...
... veins of segregation , which in the gra- nites generally form two distinct varieties . One kind appears as irregular veins , nests , or patches , that have no deep - seated source , but die out every way , often in very short distances ...
Page 28
... veins of segregation are undoubtedly more siliceous than the rock which they traverse . Moreover , they are more compact , and finely crystalline . These latter peculiarities may , however , be due to the final rapid cooling when in the ...
... veins of segregation are undoubtedly more siliceous than the rock which they traverse . Moreover , they are more compact , and finely crystalline . These latter peculiarities may , however , be due to the final rapid cooling when in the ...
Page 29
... 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 the quartz in the granityte seems to have crystallized out prior to ...
... 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 the quartz in the granityte seems to have crystallized out prior to ...
Page 30
... veins of segregation ; very coarsely and irregularly crystallized , the conspicuous constituents , according to Cotta , being " orthoclase , quartz , and silvery - white mica . " Nevertheless , it 30 HANDY - BOOK OF ROCK NAMES .
... veins of segregation ; very coarsely and irregularly crystallized , the conspicuous constituents , according to Cotta , being " orthoclase , quartz , and silvery - white mica . " Nevertheless , it 30 HANDY - BOOK OF ROCK NAMES .
Page 31
... 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 crystal- line , usually occurs in minute ...
... 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 crystal- line , usually occurs in minute ...
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A Handy Book of Rock Names: With Brief Descriptions of the Rocks (1873) G. Henry Kinahan No preview available - 2008 |
Common terms and phrases
aggregate of quartz amphibole Amygdaloidal appear Arenaceous Argillous Augyte basic beds Bituminous Breccia Calcareous called Carbonaceous Chloritic classed clay coal colour compact Concretionary conglomerate Conglomeritic constituents containing Cotta crystalline crystals Cupriferous deposited Derivate rocks Diabase Dioryte Dolomitic drift dykes earth elvanyte Euryte felsitic felspar felspathic felstone Ferruginous Fibrous fissile foliation formed gneiss Gneissoid gneissyte granite granitoid granityte granular grit Group Hematitic Hornblendic igneous rocks ingenite rocks intrusive granite Ireland Jukes labradorite lamination latter layers less Lignyte limestone marcasite marl mass matrix metamorphic metamorphosed mica Micaceous minerals Nodular occur oligoclase oligoclase granite Ophyte orthoclase passage-rock Plutonic rocks Porphyritic Protogene pyrite pyroxene quartz Quartzose quartzyte reddish Ribaned ripidolite sand sandstone schist schistose sedimentary rocks shale siliceous slate slaty sometimes Spheroidal Steatyte Structural Varieties Subgroup Subvar Subvarieties surface Syenyte talc Talcose texture Trachyte tuff Tuffose turf usually Varieties in Composition veins of segregation Vesicular Volcanic weather Whinstone