﻿386 



ME. T. 0. B0SW0RTH ON METAMOEPHISM 



[Aug. 



HO, 



garnet ; but under the microscope they are seen to contain, besides 

 the sillimanite, abundant cordierite, some andalusite, grains of 

 green spinel, and a considerable amount of apatite (14160 & 

 14161). 1 Frequently they are, to some extent, penetrated by strings 

 of granitic matter along the foliation ; and sillimanite is specially 

 clustered around the clots of intrusive matter, as though chemical 



Fig. b.— Weathered surface of altered schist with knobs of sillimanite 

 prisms. (The white stick lying in the foreground is 6 inches 

 long.) 



T. O. B. 1908. 



reaction had taken place there. There are good examples among 

 the schist-masses included in the granite about 3| miles west- 

 south-west of Bunessan, between Cnoc Dubh and Torr Mor. 



Differing from the above are other cases, notably around Eendoran 

 Cottage, where the patches of altered schist have an unusual ap- 

 pearance, and the new minerals are in such quantity that it seems 

 likely that extensive recrystallization occurred. The resulting rock 



1 These numerals refer to the numbers of the microscope slides preserved in 

 the collections of the Geological Survey. 



