Transactions of the Cambridge Philosophical SocietyUniversity Press, 1822 |
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الصفحة 98
... granular base in which are imbedded large crystals of felspar . We may observe also that these large crystals often exhibit a bright clear fracture , while the felspar of the base is dull , earthy and decomposing . The large prismatic ...
... granular base in which are imbedded large crystals of felspar . We may observe also that these large crystals often exhibit a bright clear fracture , while the felspar of the base is dull , earthy and decomposing . The large prismatic ...
الصفحة 100
... granular aggregate ; porphyritic , with large and very brilliant crystals of white felspar . The large crystals sometimes prevailed nearly to the exclusion of the base : and the face of the rock then exhibited a very uncommon appearance ...
... granular aggregate ; porphyritic , with large and very brilliant crystals of white felspar . The large crystals sometimes prevailed nearly to the exclusion of the base : and the face of the rock then exhibited a very uncommon appearance ...
الصفحة 101
... granular texture . But even in these instances , a fracture will often shew the crystals of felspar , passing from the surrounding granite into the imbedded nodule without any apparent interruption in their form . It would lead me into ...
... granular texture . But even in these instances , a fracture will often shew the crystals of felspar , passing from the surrounding granite into the imbedded nodule without any apparent interruption in their form . It would lead me into ...
الصفحة 105
... has already been mentioned . A still more common rock is composed of quartz , felspar , and schorl . See Granite , No. 60.—No. 65 . Schorl rock ( that is , a granular compound of PROFESSOR SEDGWICK on the Geology of Cornwall , & c . 105.
... has already been mentioned . A still more common rock is composed of quartz , felspar , and schorl . See Granite , No. 60.—No. 65 . Schorl rock ( that is , a granular compound of PROFESSOR SEDGWICK on the Geology of Cornwall , & c . 105.
الصفحة 106
... Granular quartz rock , with deeply striated prismatic crystals of schorl , of a coal black colour , and without regular terminations uniformly disseminated through the mass * . It is most commonly of finer texture than the granite ; but ...
... Granular quartz rock , with deeply striated prismatic crystals of schorl , of a coal black colour , and without regular terminations uniformly disseminated through the mass * . It is most commonly of finer texture than the granite ; 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