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| Keywords: The Quarterly journal of the Geological Society of London (14096454663).jpg 158 <br> F ETJTLET ON BEECCIATED POKPIDO-ROSSO ANTICO <br> crystalline and has a bluish-grey tint while the cement has a more <br> coarsely crystalline texture and is nearly colourless <br> Brecciated Porjldo-rosso antico x 18 ; by ordinary transmitted <br> light <br> The siliceous cetnent is indicated on the margin by the letter C and a line <br> The distinctly-drawn crystals are chiefly hornblende <br> w mwM <br> Â¥m <br> – O rf <br> 41 <br> ri <br> FrcuvKH rU lii <br> The difference between the fragments and the cement is still more strongly <br> mai'ked when the section is viewed between crossed nicols <br> When the section is placed on an opaque white ground and <br> examined by reflected light the fragments appear of a pale <br> yellowish colour and their borders which by transmitted light <br> appeared dark now exhibit a deep yellowish or coffee-colour <br> On a black ground by reflected light the fragments have a <br> yellowish-red colour with a more intensely red border in the outer <br> edge of which there is usually a belt of yellowish-white opaque <br> granules The latter are apparent kaolinized felspar ” similar <br> granules flecks and altered felspar crystals occurring irregularly <br> scattered through the interior of the porphyrite fragments <br> The character of the borders of these fragments indicates decom- 37047004 114009 51125 Page 158 Text 41 http //www biodiversitylibrary org/page/37047004 1885 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 41 1885 Geology Periodicals Smithsonian Libraries bhl page 37047004 dc identifier http //biodiversitylibrary org/page/37047004 smithsonian libraries Information field Flickr posted date ISOdate 2014-04-30 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/14096454663 2015-08-26 04 54 30 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1885 Photos uploaded from Flickr by Fæ using a script | ||||
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