Transactions of the Cambridge Philosophical SocietyUniversity Press, 1822 |
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الصفحة 112
... texture , though sometimes exhibiting a cloudy or striped appearance , from its intimate association with a variety of compact felspar . This rock is succeeded by 112 Professor SEDGWICK on the Geology of Cornwall , & c .
... texture , though sometimes exhibiting a cloudy or striped appearance , from its intimate association with a variety of compact felspar . This rock is succeeded by 112 Professor SEDGWICK on the Geology of Cornwall , & c .
الصفحة 113
Cambridge Philosophical Society. variety of compact felspar . This rock is succeeded by and alternates with other schistose masses which will be described in their proper place . We have before observed , that the slate reposes ...
Cambridge Philosophical Society. variety of compact felspar . This rock is succeeded by and alternates with other schistose masses which will be described in their proper place . We have before observed , that the slate reposes ...
الصفحة 133
... compact homogene- ous varieties , when breathed upon , give out a strong argillaceous odour . Their mean specific gravity is about 2. 67. When small splinters are examined with a lens , they are found to have the tex- ture , and greasy ...
... compact homogene- ous varieties , when breathed upon , give out a strong argillaceous odour . Their mean specific gravity is about 2. 67. When small splinters are examined with a lens , they are found to have the tex- ture , and greasy ...
الصفحة 134
... compact than crystalline ; in some instances both constituents are crystalline , and the larger grained varieties pass into syenite . + See Killas , Nos . 63--72 . compact ; and in some places so intimately mixed with 134 Professor ...
... compact than crystalline ; in some instances both constituents are crystalline , and the larger grained varieties pass into syenite . + See Killas , Nos . 63--72 . compact ; and in some places so intimately mixed with 134 Professor ...
الصفحة 135
... compact felspar . These beds were in some instances much contorted on the small scale . 4. Hornblende rock with veins of actinolite . 5. Actinolite rock . 6. Compact axinite , from an irregular bed . 7. A rock of nearly the same aspect ...
... compact felspar . These beds were in some instances much contorted on the small scale . 4. Hornblende rock with veins of actinolite . 5. Actinolite rock . 6. Compact axinite , from an irregular bed . 7. A rock of nearly the same aspect ...
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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