Transactions of the Cambridge Philosophical SocietyUniversity Press, 1822 |
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الصفحة 98
... felspar which is the predomi- nating ingredient . When examined on the great scale , it is often found porphyritic ; the three constituents forming a granular base in which are imbedded large crystals of felspar . We may observe also ...
... felspar which is the predomi- nating ingredient . When examined on the great scale , it is often found porphyritic ; the three constituents forming a granular base in which are imbedded large crystals of felspar . We may observe also ...
الصفحة 99
... felspar is often crystallized in forms which are perfectly exhibited . Twin crystals arising from the intersection of two rhombs , and hexagonal tables , The granite bowlders on the moors are among these varieties . afford most ...
... felspar is often crystallized in forms which are perfectly exhibited . Twin crystals arising from the intersection of two rhombs , and hexagonal tables , The granite bowlders on the moors are among these varieties . afford most ...
الصفحة 100
... felspar of a greenish colour . 4. A beautiful light - coloured 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 ...
... felspar of a greenish colour . 4. A beautiful light - coloured 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 ...
الصفحة 101
... felspar , passing from the surrounding granite into the imbedded nodule without any apparent interruption in their form . It would lead me into unnecessary details to consider at greater length the varieties of granite arising from the ...
... felspar , passing from the surrounding granite into the imbedded nodule without any apparent interruption in their form . It would lead me into unnecessary details to consider at greater length the varieties of granite arising from the ...
الصفحة 103
... felspar which is the prevailing constituent . Ramond ( Voyage au Mont Perdu ) seems to regard the prismatic blocks as true crystalline forms derived from the combined action of all the crystalline forces exercised at the time of the ...
... felspar which is the prevailing constituent . Ramond ( Voyage au Mont Perdu ) seems to regard the prismatic blocks as true crystalline forms derived from the combined action of all the crystalline forces exercised at the time of the ...
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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