Transactions of the Cambridge Philosophical SocietyUniversity Press, 1822 |
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الصفحة 25
... Stone ( Apophyllite ) which possesses a single axis of double refraction , has been noticed by Dr. Brewster , and ... green , and a little less for the violet , being the only instance yet adduced in the whole circle of optical phenomena ...
... Stone ( Apophyllite ) which possesses a single axis of double refraction , has been noticed by Dr. Brewster , and ... green , and a little less for the violet , being the only instance yet adduced in the whole circle of optical phenomena ...
الصفحة 26
... Stone , which though not very transparent , owing to air included between its laminæ , was yet sufficiently so to ... green , blue , 3d Order . 4th Order . purple . 5th Order . 6th Order . Good pink , orange yellow , tolerable green ...
... Stone , which though not very transparent , owing to air included between its laminæ , was yet sufficiently so to ... green , blue , 3d Order . 4th Order . purple . 5th Order . 6th Order . Good pink , orange yellow , tolerable green ...
الصفحة 103
... stone procured from rocks which present such evident traces of decomposition ... stone ; and this is unfortunately the * The separation of decomposing granite ... greenstone of Corsica . The aggregation , when further continued , would ...
... stone procured from rocks which present such evident traces of decomposition ... stone ; and this is unfortunately the * The separation of decomposing granite ... greenstone of Corsica . The aggregation , when further continued , would ...
الصفحة 117
... greenstone ; and from the uniform direction of its dip , plainly points out the part of the coast where the granite may be expected to re - appear . About a quarter of a mile east of Trewavas Point the cliffs are in an unusually ruinous ...
... greenstone ; and from the uniform direction of its dip , plainly points out the part of the coast where the granite may be expected to re - appear . About a quarter of a mile east of Trewavas Point the cliffs are in an unusually ruinous ...
الصفحة 133
... greenstone * At the junction of the granite and slate in the Dolcoath mine we found a porphyritic rock ( see Killas , Nos . 101 , 102. ) which differed from any bed we remember to have seen in a similar situation . In some other ...
... greenstone * At the junction of the granite and slate in the Dolcoath mine we found a porphyritic rock ( see Killas , Nos . 101 , 102. ) which differed from any bed we remember to have seen in a similar situation . In some other ...
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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