Transactions of the Cambridge Philosophical SocietyUniversity Press, 1822 |
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النتائج 1-5 من 10
الصفحة 100
... schorl of a green colour . Among the varieties of aggregation may be mentioned the strange appearance of nodular concretions , which abound in some * See Granite series , Nos . 32—46 . part of the cliffs west of Castle - Trereen . 100 ...
... schorl of a green colour . Among the varieties of aggregation may be mentioned the strange appearance of nodular concretions , which abound in some * See Granite series , Nos . 32—46 . part of the cliffs west of Castle - Trereen . 100 ...
الصفحة 105
... schorl or oxide of tin ) so dis- seminated as to become a true constituent of the mass . 2. From the disappearance ... schorl . See Granite , No. 60.—No. 65 . Schorl rock ( that is , a granular compound of PROFESSOR SEDGWICK on the ...
... schorl or oxide of tin ) so dis- seminated as to become a true constituent of the mass . 2. From the disappearance ... schorl . See Granite , No. 60.—No. 65 . Schorl rock ( that is , a granular compound of PROFESSOR SEDGWICK on the ...
الصفحة 106
... schorl , of a coal black colour , and without regular terminations uniformly disseminated through the mass * . It is ... schorl several inches in length . 2. Where quartz prevails nearly to the exclusion of the schorl which only appears ...
... schorl , of a coal black colour , and without regular terminations uniformly disseminated through the mass * . It is ... schorl several inches in length . 2. Where quartz prevails nearly to the exclusion of the schorl which only appears ...
الصفحة 107
... schorl rock varying from the fraction of an inch to many feet in thickness . Between Lemorna - Cove and Land's End ; we not only meet with these schorl - rock veins , but with some other phenomena of which it is difficult to convey an ...
... schorl rock varying from the fraction of an inch to many feet in thickness . Between Lemorna - Cove and Land's End ; we not only meet with these schorl - rock veins , but with some other phenomena of which it is difficult to convey an ...
الصفحة 108
... schorl . These veins are singularly tough and difficult of fracture , and obviously differ only in the colour and ... schorl rock . Its chief constituents are quartz , felspar , schorl , and oxide of tin , with occasional specks of mica ...
... schorl . These veins are singularly tough and difficult of fracture , and obviously differ only in the colour and ... schorl rock . Its chief constituents are quartz , felspar , schorl , and oxide of tin , with occasional specks of mica ...
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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