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| Keywords: The Quarterly journal of the Geological Society of London (13937369872).jpg 532 MAJOR-GENERAL C A m'MAHON ON THE HORNBLENDE-SCHISTS <br> a tabular form of the result of the microscopic examination of some <br> samples of them collected by me <br> No <br> Locality from which the <br> specimens were taken <br> Pentreath Beach H <br> ditto H <br> Pen Voose H <br> ditto \R <br> Cadgwith iH <br> ditto H <br> Pen Voose H <br> Pentreath H <br> Flag-staff Quarry Cadgwith H <br> Pen Voose H <br> Kennack Cove H <br> Pen Voose H <br> ditto <br> ditto <br> Flag-staff Quarry Cadgwith <br> ditto <br> Pentreath <br> Kennack Cove \ <br> ditto <br> 7i <br> Q Mi <br> Q Mi <br> QjMi <br> Q Mi <br> QjMi <br> Q Mi <br> Q Mi <br> Mi <br> I Mi <br> I Mi <br> <br> Q Mi <br> Q ' Mi <br> Q Mi <br> Q Mi <br> QMi <br> Mi <br> Mi <br> Mi <br> -2 <br> -+j <br> c3 <br> J3 <br> P- <br> P <br> <br> w <br> Ap <br> Sph <br> Ap <br> Sph <br> Ap <br> Sph <br> Ap <br> Sph <br> Ap Sph <br> Ap Sph <br> Ap Sph <br> Ap <br> Ap Sph <br> ;;; s P h <br> Ma <br> Ma <br> Ma <br> Ma <br> Ma <br> Ma <br> Ma <br> Ap <br> Ap Sph Ma <br> Ap Sph <br> Ap Sph Ma <br> Ma <br> Ap <br> Chi <br> Chi <br> cm <br> Chi <br> w <br> w <br> f w <br> Granites undoubtedly intrusive in the Granulitic group <br> Pen Voose <br> ditto <br> Cadgwith <br> ditto <br> 'F Q <br> F Q <br> F Q <br> 122316 <br> Mi <br> Mi <br> Mi <br> Mi <br> 22 <br> Ap <br> Ap <br> Ap <br> Ap <br> IS <br> 12 <br> 10 <br> f Indicates that these specimens are more or less foliated <br> b Specimens taken from black bands in the granulitic rocks <br> w Specimens taken from white bands in the granulitic rocks <br> Felspar it will be observed is common to all the specimens It <br> forms the base in which the other minerals are imbedded and here <br> and there it exhibits the twinning of plagioclase It is generally <br> more or less decomposed but it is occasionally water-clear <br> The felspar in all these rocks affords more or less evidence of <br> incipient saussurization round patches opaque in transmitted light <br> and of pearly white colour in reflected light have been formed here <br> and there which have no definite relation to the shape of the crystals <br> containing them Possibly the granular appearance often given to <br> the rock by these white spots may have suggested the term granu- <br> lite If so it simply denotes the progress of decay and gives no <br> clue to the original structure of the rock <br> Mica is another mineral found in all but one of the samples <br> The predominant type is a mica at one end of the scale and a chlorite <br> at the other ; but it is often difficult to say regarding the interme- 36940361 113696 51125 Page 530 Text 45 http //www biodiversitylibrary org/page/36940361 1889 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 45 1889 Geology Periodicals Smithsonian Libraries bhl page 36940361 dc identifier http //biodiversitylibrary org/page/36940361 smithsonian libraries Information field Flickr posted date ISOdate 2014-04-21 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13937369872 2015-08-26 05 52 42 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1889 Photos uploaded from Flickr by Fæ using a script | ||||
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