Transactions of the Cambridge Philosophical SocietyUniversity Press, 1822 |
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الصفحة 133
... hornblende - rock and greenstone * At the junction of the granite and slate in the Dolcoath mine we found a porphyritic rock ( see Killas , Nos . 101 , 102. ) which differed from any bed we remember to have seen in a similar situation ...
... hornblende - rock and greenstone * At the junction of the granite and slate in the Dolcoath mine we found a porphyritic rock ( see Killas , Nos . 101 , 102. ) which differed from any bed we remember to have seen in a similar situation ...
الصفحة 134
... hornblende rocks abound on every side of the granitic tract between Merazion and Land's End . We should , however , be led into an error if we attempted to generalize the phenomena presented at the eastern and western extremity of the ...
... hornblende rocks abound on every side of the granitic tract between Merazion and Land's End . We should , however , be led into an error if we attempted to generalize the phenomena presented at the eastern and western extremity of the ...
الصفحة 135
... hornblende rock . 2. Slaty hornblende rock , with traces of chlorite between the laminæ . 3. The same rock with alternating laminæ of compact felspar . These beds were in some instances much contorted on the small scale . 4. Hornblende ...
... hornblende rock . 2. Slaty hornblende rock , with traces of chlorite between the laminæ . 3. The same rock with alternating laminæ of compact felspar . These beds were in some instances much contorted on the small scale . 4. Hornblende ...
الصفحة 136
... hornblende rock , somewhat earthy in its fracture , and in texture nearly resembling common basalt . It is not without some hesitation , that we venture to class the rocks of St. Cleer Downs , with the conformable beds above described ...
... hornblende rock , somewhat earthy in its fracture , and in texture nearly resembling common basalt . It is not without some hesitation , that we venture to class the rocks of St. Cleer Downs , with the conformable beds above described ...
الصفحة 296
... hornblende slate . Before we had descend- ed to the village of Porthalla , we observed that some of the last beds of the formation were intersected by innumerable veins of carbonate of lime , apparently of contemporaneous origin . It ...
... hornblende slate . Before we had descend- ed to the village of Porthalla , we observed that some of the last beds of the formation were intersected by innumerable veins of carbonate of lime , apparently of contemporaneous origin . It ...
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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