Transactions of the Cambridge Philosophical SocietyUniversity Press, 1822 |
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الصفحة 138
... steatite . Examples occur near Duporth , where the kernels of pure steatite form the predominating part of the rock . From Patterbury - top , a hill about two miles north - east of Clicker - Tor , we obtained some specimens of a very ...
... steatite . Examples occur near Duporth , where the kernels of pure steatite form the predominating part of the rock . From Patterbury - top , a hill about two miles north - east of Clicker - Tor , we obtained some specimens of a very ...
الصفحة 145
... steatite was the prevailing part of the base . In that district also , we remarked steatite entering into the composition of a rock , and passing by insensible gradations into veins of fibrous asbestus . Masses of transition clay ...
... steatite was the prevailing part of the base . In that district also , we remarked steatite entering into the composition of a rock , and passing by insensible gradations into veins of fibrous asbestus . Masses of transition clay ...
الصفحة 298
... steatite in different states of induration ; or with asbestos , the fibres of which are at right - angles to the fissures . The blocks have a splintery fracture , and break into very irregular fragments . In the planes of fracture , we ...
... steatite in different states of induration ; or with asbestos , the fibres of which are at right - angles to the fissures . The blocks have a splintery fracture , and break into very irregular fragments . In the planes of fracture , we ...
الصفحة 307
... steatite , and some small spe- cimens of foliated talc . Beyond this point , an extensive series of beds , composed of granular felspar , felspar porphyry , granular diallage rock , green - stone , and green - stone porphyry , occupied ...
... steatite , and some small spe- cimens of foliated talc . Beyond this point , an extensive series of beds , composed of granular felspar , felspar porphyry , granular diallage rock , green - stone , and green - stone porphyry , occupied ...
الصفحة 319
... steatite ; and occasionally coated with soft unctuous folia of talc . In some of the larger cavities are considerable nests of mica . Quartz is also irregularly as- sociated with this dyke in the form of veins , rather than as a true ...
... steatite ; and occasionally coated with soft unctuous folia of talc . In some of the larger cavities are considerable nests of mica . Quartz is also irregularly as- sociated with this dyke in the form of veins , rather than as a true ...
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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