98 



The faces figured in fig. 6, are those occurring most rarely 

 of all, viz. s {201}, and ?<{ll4}; each of them has only been 

 observed in a couple of crystals, in one case they were both 

 found in one crystal ; they are always rather small and incon- 

 spicuous. 



Fig. 6. Eli kite. 



With regard to the nature of the faces it is otherwise only 

 to be noted that the only striated ones are a few of the pris- 

 matic faces, viz. o(l30}, and ^» {270}, which are generally 

 strongly striated vertically ; further the brachydomes may some- 

 times be quite slightly striated horizontally. The other faces 

 are not especially plane, but are most frequently provided with 

 casual uneven spots, or they are, generally, however, only to 

 a slight degree, curved and faceted. 



Physical properties. 



The specific weight measured by the pycnometer, is 3"493; 

 the hardness is 0V2— 6. Cleavage is wanting; the fracture is 

 uneven. The erikite is rather strongly coherent, so that the 



