A Handy-book of Rock Names, with Brief Descriptions of the Rocks |
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Page 26
... ROCK S. HE typical rock of this class is a crystalline aggregate of quartz , felspars , and micas , nearly universally known as granite or granyte [ Celtic gran , Lat . granum , a grain . ] * There are , however , rocks called granite ...
... ROCK S. HE typical rock of this class is a crystalline aggregate of quartz , felspars , and micas , nearly universally known as granite or granyte [ Celtic gran , Lat . granum , a grain . ] * There are , however , rocks called granite ...
Page 27
... aggregate of quartz and orthoclase with black and white mica ; pyrite and marcasite are often constituents ; while Haughton seems to believe that most , if not all , intrusive granites also contain albite . NOTE . Haughton finds the ...
... aggregate of quartz and orthoclase with black and white mica ; pyrite and marcasite are often constituents ; while Haughton seems to believe that most , if not all , intrusive granites also contain albite . NOTE . Haughton finds the ...
Page 29
... rock , usually purplish or red- dish purple in colour . An aggregate of 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 ...
... rock , usually purplish or red- dish purple in colour . An aggregate of 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 ...
Page 30
... quartz ; however , with a lens , both of these substances can be detected , but usually they appear to be sparingly and partially developed . F. GREISSEN ; QUARTZITIC GRANITE . - Apparently a crystalline granular aggregate of quartz and ...
... quartz ; however , with a lens , both of these substances can be detected , but usually they appear to be sparingly and partially developed . F. GREISSEN ; QUARTZITIC GRANITE . - Apparently a crystalline granular aggregate of quartz and ...
Page 32
... aggregate of quartz , black and white mica , orthoclase , and oligo- clase . When typical , it is a quinary granite ; how- ever it is very variable in its composition , which in part seems due to its metamorphic origin . Many minerals ...
... aggregate of quartz , black and white mica , orthoclase , and oligo- clase . When typical , it is a quinary granite ; how- ever it is very variable in its composition , which in part seems due to its metamorphic origin . Many minerals ...
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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