Transactions of the Cambridge Philosophical SocietyUniversity Press, 1822 |
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الصفحة 105
... schist is composed of bright red felspar and quartz ; pre- senting some traces of that aggregation which forms the ... chlorite , is found in contact with the killas at the junction near Polmear Porth . A similar aggregate from the ...
... schist is composed of bright red felspar and quartz ; pre- senting some traces of that aggregation which forms the ... chlorite , is found in contact with the killas at the junction near Polmear Porth . A similar aggregate from the ...
الصفحة 128
Cambridge Philosophical Society. the laminæ of schist between which they are found . In other instances they assume the ... mica . 5. A granitic rock with much chlorite . 6. Schorl rock ; rather fine grained . Among the specimens in the ...
Cambridge Philosophical Society. the laminæ of schist between which they are found . In other instances they assume the ... mica . 5. A granitic rock with much chlorite . 6. Schorl rock ; rather fine grained . Among the specimens in the ...
الصفحة 138
... schist , as light and porous as a piece of pumice .. Our examination only extended to a small part of the north ... chlorite 138 Professor SEDGWICK on the Geology of Cornwall , & c .
... schist , as light and porous as a piece of pumice .. Our examination only extended to a small part of the north ... chlorite 138 Professor SEDGWICK on the Geology of Cornwall , & c .
الصفحة 316
... chlorite slate . It fuses , with great ease , into a black glass , which ... schist of St. Agnes . In one place it had been rent asunder , and the chasm ... schist , which alternated with each other ; occasionally in distinct beds , but ...
... chlorite slate . It fuses , with great ease , into a black glass , which ... schist of St. Agnes . In one place it had been rent asunder , and the chasm ... schist , which alternated with each other ; occasionally in distinct beds , but ...
الصفحة 365
... Chlorite Schist . { Nos . 12 to 187. } Under this denomination are included several varieties of schist , of which quartz and chlorite form the principal ingre- dients . Mica slate and clay slate also occur in the same forma- tion , but ...
... Chlorite Schist . { Nos . 12 to 187. } Under this denomination are included several varieties of schist , of which quartz and chlorite form the principal ingre- dients . Mica slate and clay slate also occur in the same forma- tion , but ...
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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