﻿Vol. 66.-] 



ABOUND THE BOSS OF MT7LL GRANITE. 



393 



weathered faces. It is remarkable that, although the rock is 

 rumpled, these crystals, which are of large size, sometimes 3 inches 

 long, generally show few, if any, traces of disturbance. 



In one instance, however, in a small pegmatite knot, a group of 

 kyanite prisms was seen keeping a straight course for a length of 

 3 inches, then bending round by means of a series of fractures 

 through about 130° and continuing in this direction for another 

 inch. Crumpled mica occupies the inside of the bend (fig. 10). 

 The original specimen is now in the Geological Survey Collection. 



Fig. 10. — Curved and fractured Jcyanite, natural size. 



E L. 1910. 



In section (13970) this gneiss is seen to consist of coarse brown 

 biotite, strained quartz, clear felspar (some with Carlsbad and 

 albite twinning, but most of it showing none), large colourless 

 garnets crowded with inclusions, rutile in stumpy prisms, and large 

 clear kyanite. 



The other occurrence of these two minerals is on the east side 

 of Port Bhethain, a mile west-south-west of Scoor. The kyanite 

 here is in thin pale prisms about half an inch long, in a schist of 

 unusual appearance, consisting of dark mica with very little quartz 

 and felspar, but containing well-shaped garnets often as big as a 

 golf-ball. 



Q. J. G. S. No. 263. 2 e 



