97 



Of somewhat rarer occurrence are such forms as are repre- 

 sented by figs. 4 and 5 where, besides the mentioned faces, we 



Fig. 4. Erikite. 



find ä{052}, and г{031} in fig. 4, and e{01l}, /"{032}, w{l20}, 

 and ij{270} in fig. 5. 



p- oni 



Fig. 5. Erikite. 



Between these two forms numerous transitional forms are 

 found, and the mentioned supervening faces are distributed in 

 several different ways, sometimes they may also all be found 

 in one crystal. 



XXVI. - 



