Transactions of the Cambridge Philosophical SocietyUniversity Press, 1822 |
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الصفحة 89
... Granite , Granite . Veins , & c . , § . 5 . Elvan Courses , & c . . § . 6 . Killas . § . 7. Formations subordinate to the Killas . § . 1. Red Sandstone , Conglomerate , and Greywacké of Somersetshire , & c . THE observations which I ...
... Granite , Granite . Veins , & c . , § . 5 . Elvan Courses , & c . . § . 6 . Killas . § . 7. Formations subordinate to the Killas . § . 1. Red Sandstone , Conglomerate , and Greywacké of Somersetshire , & c . THE observations which I ...
الصفحة 95
... veins which continue to be worked to great advantage , more especially in ... granite break- ing out from under the slate ; the junction of the two rocks ... granite . The ridge to the south - east of Camelford , the extended moors to the ...
... veins which continue to be worked to great advantage , more especially in ... granite break- ing out from under the slate ; the junction of the two rocks ... granite . The ridge to the south - east of Camelford , the extended moors to the ...
الصفحة 99
... granite bowlders on the moors are among these varieties . afford most favourable opportunities for examining such ... veins ; and therefore do not belong to the present part of my inquiry . The mica is occasionally crystallized in hexagonal ...
... granite bowlders on the moors are among these varieties . afford most favourable opportunities for examining such ... veins ; and therefore do not belong to the present part of my inquiry . The mica is occasionally crystallized in hexagonal ...
الصفحة 104
... granite ; which may be considered as an exhibition of that rock in its last ... granite which contains so much silvery mica , exhibits the peculiar decom ... veins of quartz . near examination it is frequently found soft enough to be ...
... granite ; which may be considered as an exhibition of that rock in its last ... granite which contains so much silvery mica , exhibits the peculiar decom ... veins of quartz . near examination it is frequently found soft enough to be ...
الصفحة 107
... veins , or irregular masses which were once imbedded in the granite . This opinion is confirmed by the appearance of the western cliffs , which are irregularly traversed by veins of schorl rock varying from the fraction of an inch to ...
... veins , or irregular masses which were once imbedded in the granite . This opinion is confirmed by the appearance of the western cliffs , which are irregularly traversed by veins of schorl rock varying from the fraction of an inch to ...
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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