252 PROCEEDINGS OF THE CANADIAN INSTITUTE. 



The foUowiiig forms I have obsei'ved : 



1. Hexag. prism, — pentag. rhomb, planes. 



2. Hexag. jjrism — three rhomb, planes. 



3. Hexag. prism — rhomb, and haaal plane. 



4. Hexag. prism — the hemi form predominating, and 

 rhomb. p]ane.s. 



0, Hemi hexag. prism — and three rhomb, planes. 



6. N.B. — These few figures roughly drawn are simply 

 given to illustrate the variety of forms occurring in 

 these veins. 



A 



m^} 



A 



8. Hexag. prism. 



