Transactions of the Cambridge Philosophical SocietyUniversity Press, 1822 |
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الصفحة 144
... serpentine rocks of the Lizard district , and the other mineral masses associated with them , we conceive to be strictly subordinate to the great formation described in the preceding section . They form so remarkable an exception to the ...
... serpentine rocks of the Lizard district , and the other mineral masses associated with them , we conceive to be strictly subordinate to the great formation described in the preceding section . They form so remarkable an exception to the ...
الصفحة 293
... serpentine . The presence of the porphyry is indicated by innumerable bowlders composed of the hard nuclei of masses which were once spread over the surface . Almost with equal certainty , the extent of the serpentine is marked out by ...
... serpentine . The presence of the porphyry is indicated by innumerable bowlders composed of the hard nuclei of masses which were once spread over the surface . Almost with equal certainty , the extent of the serpentine is marked out by ...
الصفحة 294
... serpentine , and often so intimately interlaced with it , that it would be next to impossible to trace their line of separation , even in the vicinity of the cliffs . The task has not yet been successfully attempted : nor would much ...
... serpentine , and often so intimately interlaced with it , that it would be next to impossible to trace their line of separation , even in the vicinity of the cliffs . The task has not yet been successfully attempted : nor would much ...
الصفحة 297
... serpentine and green - stone , which succeeds immediately to the south . It was the first illustration in this district of a fact of very common observation ; that those mineral masses which occur at the junction of two formations , or ...
... serpentine and green - stone , which succeeds immediately to the south . It was the first illustration in this district of a fact of very common observation ; that those mineral masses which occur at the junction of two formations , or ...
الصفحة 298
... serpentine , as we expected , very untractable in the flame of the blow - pipe . After being acted on for some time , the edges of minute splinters became white , and presented a glazed surface . Fragments , which had remained some time ...
... serpentine , as we expected , very untractable in the flame of the blow - pipe . After being acted on for some time , the edges of minute splinters became white , and presented a glazed surface . Fragments , which had remained some time ...
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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