106 Canadian Record of Science. 



having its garnets a shade more purple, and in an approacli 

 to a banded structure : the diopside being rather more 

 abundant in a middle zone, the garnet in one, the en- 

 statite in the other of the outer zones. Being satisfied 

 that it is merely a variety of the last-described rock, I 

 have preferred to leave it as an intact boulder. 



6. The next fragment, measuring about 3 in. by 1\ in. 

 by 2 in. and retaining part of its smooth outer surface, is 

 labelled " Found in the yellow ground of No. 2 mine,^ 50 

 feet 4eep." Though it is much more decomposed than 

 the others, the purplish garnet, the emerald-green 

 pyroxene, the altered enstatite (here very rotten), and a 

 flake or two of phlogophite (?) are easily made out. It is 

 obviously a more decomposed specimen of the rock repre- 

 sented by the two preceding specimens. 



7. The last of this group of specimens is a rock fragment,' 

 measuring about oh in. by 2 in. in length and breadth, 

 and slightly exceeding an inch in greatest thickness. Its 

 outline is irregular, being determined by the fracture of 

 the predominant diallage-like mineral. The crvstals of 

 this run large, an inch or more in length, breadth, and 

 thickness. It is greyish-green in colour, having one 

 dominant cleavage, with a sub-metallic lustre, and close 

 subordinate cleavages, giving a somewhat fibrous aspect 

 to that surface. Between these large crystalline lumps, 

 numerous small, ill-defined garnets (pyrope) seem crowded, 

 so as to form fairly continuous partings, generally hardly 

 0.1 inch in thickness. As the readiness with which the 

 rather soft pyroxenic constituent split away made it 

 improbable that a good slice could be cut, and I was 

 reluctant to injure the specimen, I contented myself with 

 detaching a few flakes of this constituent for microscopic 

 work, since the determination of its identity was sufficient 



1 Tlie others come fioin aiiotlier mine (No. 1). 



2 I am informed tliat this was not part of a Imuldi'i', but came imt of tlie "blue 

 gioiuid" nearly in its jneseiit coiulitioii. 



