W. E. Ford — Chemical Composition of Axinite. 201 



is for the crystals to be grouped in nearly but not quite parallel 

 position, all of the crystals curving in one direction correspond- 

 ing to that of the zone s — x. The sharp edge between the x 

 face and the M behind is usually prominently developed and 

 forms the characteristic termination of the projecting crystals. 



An entirely different type of crystal was observed on another 

 specimen from the same locality and which is represented by 



fig. 



Here in addition to the forms b, M, s, x and r already 



mentioned, the forms c (001), ^(023) and y (021) were observed, 

 and the large development of the zone <?, g, y, b gives an unusual 

 habit quite unlike that of ordinary axinite. All of the faces 

 that were identified are represented in the iigiire. 



It is with pleasure that acknowledgment is here made by 

 the writer for the constant advice and assistance given him by 

 Prof. S. L. Penfield, during the preparation of this article. 



Sheffield Laboratory of Mineralogy, 

 Yale University, New Haven. 



