Transactions of the Cambridge Philosophical SocietyUniversity Press, 1822 |
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النتائج 6-10 من 38
الصفحة 108
... veins of true granite are others of far different character , composed of large crystals of felspar of a brilliant red colour , occasionally mixed with divergent crystals of schorl . These veins are singularly tough and difficult of ...
... veins of true granite are others of far different character , composed of large crystals of felspar of a brilliant red colour , occasionally mixed with divergent crystals of schorl . These veins are singularly tough and difficult of ...
الصفحة 109
... veins , which range in a direction nearly east and west , are accompanied by ... granite . The minerals contained in them may therefore be accounted for ou ... veins irregular concretions , or imbedded masses . Accordingly , those mineral ...
... veins , which range in a direction nearly east and west , are accompanied by ... granite . The minerals contained in them may therefore be accounted for ou ... veins irregular concretions , or imbedded masses . Accordingly , those mineral ...
الصفحة 110
... Granite Veins , & c . Having in the last section enumerated some of the principal characters presented by the granite , I shall now proceed to consider the phenomena exhibited at its junction with the killas . These phenomena may be ...
... Granite Veins , & c . Having in the last section enumerated some of the principal characters presented by the granite , I shall now proceed to consider the phenomena exhibited at its junction with the killas . These phenomena may be ...
الصفحة 111
... veins * . That part of the cliffs near Wicka - pool , in which the granite re - appears , is of very small extent . From the headland nearly opposite the Carracles to St. Ives ' Bay , the killas rocks prevail without interruption ; but ...
... veins * . That part of the cliffs near Wicka - pool , in which the granite re - appears , is of very small extent . From the headland nearly opposite the Carracles to St. Ives ' Bay , the killas rocks prevail without interruption ; but ...
الصفحة 113
... granite . With reference to the general structure of the county , the assertion is undoubtedly true ; in considering ... veins which starting out from the granite traverse the superincumbent slate in all directions , has * Near Penzance ...
... granite . With reference to the general structure of the county , the assertion is undoubtedly true ; in considering ... veins which starting out from the granite traverse the superincumbent slate in all directions , has * Near Penzance ...
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ABCD acid angle Apophyllite appearance axis ball beds carbonate of lime centre character chlorite schist clay slate cliffs coast colour compact composed considerable Cornwall Cove crystalline crystals cube cylinder decomposing decomposition described deviation direction distance district dyke earthy East equation examination exhibited Fellow felspar fissures formation fracture fragments function Galvanic gazometer granite granite veins granular green green-stone greywacké Helford river horizontal hornblende hydrogen inches instance intermixed irregular killas laminæ limestone Llanbabo Llaneilian Llanerchymedd Llanfaelog Llangefni Llanrhyddlad magnetic mass mica mineral muriate Nare point nature nearly needle North observed occur old red sandstone parallel particles passing perpendicular phenomena piston plane plate polarization porphyritic portion present pyroxene quartz quartz rock resembling Rhoscolyn schistose schorl serpentine side slaty South specimens steatite strata structure substance surface texture trace Trin ureters variety vertical whole wire