I30 



bichowsky: an unusual sulfur crystal 



Figure 2 is a stereographic projection of the known faces. The 

 dots representing the known faces have an area proportional to 

 number of times reported. This figure emphasizes the more 

 important zonal relations of sulfur and particularly the predomi- 

 nance of the primary pyramid zone [iTo]. The brachy- and 

 macro-dome zones [Too] and [010], as well as the oblique zones 

 [loi] and [on], are also well developed. Among the lesser 

 zones sulfur shows a curious preference for zones (and faces) 



bOlO 



hl30 



Fig. 2. Stereographic projection of the known faces of sulfur crystaL 



with an intercept ratio involving an odd number such as 3, as 

 compared with those involving an even number such as 2. Com- 

 pare the development of the zones [130], [3T0], [103], [301], 

 [03!], [013], with the corresponding zones [120], etc. The poor 

 development of zones, except [no], having (no) as a pole is 

 interesting. The usual rule that faces at the intersection of 

 important zones are likely to be most commonly developed is 



