A Handy-book of Rock Names, with Brief Descriptions of the Rocks |
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Page 45
... layers ; or perhaps , as suggested by Scrope , to the differential motion of the vesicular and non - vesicular portions of the cooling rock . The spheroidal or concretionary arrangement seems always to occur near the end of a dyke , and ...
... layers ; or perhaps , as suggested by Scrope , to the differential motion of the vesicular and non - vesicular portions of the cooling rock . The spheroidal or concretionary arrangement seems always to occur near the end of a dyke , and ...
Page 47
... layers of somewhat dissimilar texture ; hence the fracture appears to be striped like a riban , and the rock splits more easily in the direction of those layers than across them . g . Variolitic , or Spotted quartzitic felstone , con ...
... layers of somewhat dissimilar texture ; hence the fracture appears to be striped like a riban , and the rock splits more easily in the direction of those layers than across them . g . Variolitic , or Spotted quartzitic felstone , con ...
Page 60
... layers round a kernel , each mineral forming different layers of alternate light and dark colour . G. SYENYTE , SYENITE . - A crystalline aggregate of orthoclase and amphibole , with or without quartz . The quartz appears to be more an ...
... layers round a kernel , each mineral forming different layers of alternate light and dark colour . G. SYENYTE , SYENITE . - A crystalline aggregate of orthoclase and amphibole , with or without quartz . The quartz appears to be more an ...
Page 68
... layers of fine and coarse mate- rials ; they may be conglomeritic or brecciated , when they often merge into Agglomerate . Varieties are , a . Hornblendic ; b . Pyroxenic ; c . Chloritic ; d . Calcareous ; e . Pyritous ; f . Cupriferous ...
... layers of fine and coarse mate- rials ; they may be conglomeritic or brecciated , when they often merge into Agglomerate . Varieties are , a . Hornblendic ; b . Pyroxenic ; c . Chloritic ; d . Calcareous ; e . Pyritous ; f . Cupriferous ...
Page 71
... layers . " — Cotta . Perlyte may be granular , or sphærulitic ( with compact or radial striped felsyte balls ) , or porphy- ritic , or pumiceous , or vitreous ( with resinous lustre ) , or argillaceous . c . Obsidian ( so named after ...
... layers . " — Cotta . Perlyte may be granular , or sphærulitic ( with compact or radial striped felsyte balls ) , or porphy- ritic , or pumiceous , or vitreous ( with resinous lustre ) , or argillaceous . c . Obsidian ( so named after ...
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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