THE METAMORPHIC ROCKS OF ADEL1E LAND.-STILLWELL. 



27 



Green epidote and less commonly purple fluorite are often developed along the 

 junction planes between the gneiss and the amphibolites. These minerals are also 

 found along joint planes in both granodiorite gneiss and amphibolite. Small quartz 

 segregation veins may be found in the bands, and these may carry excellent crystals 

 of epidote 2jin. and Sin. in length. 



Fig. 3. 



DIAGRAMMATIC SKETCH SHOWING A LENTICULAK 



" INCLUSION " OF AMPHIBOLTTE WHICH is BEEN 



PARTLY IN PLAN AND PARTLY IN SECTION. 



In one instance (No. 629) where a band has opened into a bulge a number of 

 inclusions of white, grey, and pink colour are found enclosed in the amphibolite. These 

 inclusions appear across the whole outcrop, but are present in greatest numbers along 

 the western side of the band. They are considered to be xenoliths and will receive 

 full description later. 



3. PETROGRAPHICAL CHARACTERS. 



The rock type presents great variation in texture, structure, and mineral content. 

 The colour is usually jet black, more rarely grey black. The texture, in some examples, 

 is highly schistose, and the dominating flaky constituent is either biotite or hornblende. 

 In fine-grained types the texture becomes slaty schistose. In some examples the texture 

 becomes approximately massive. Indeed, the texture may vary in a short distance 

 from massive to schistose in one and the same band. The predominating structure 



