63 



The forms hitherto known for epididymite are collected 

 together below under a according to the new position,- which 

 is now proposed, and under b according to the position previ- 

 ously suggested. 



a 



b 



a = {I'OO} 



b =- {010} 



ъ = {oio} 



a = {100} 



с ^ {001} 



' с = {OOl} 



m = {110} 



n = {310J 



n = {310} 



m = {110} 



I = {ш}ЗХо 



l = {210} 



d =-- {011} 



d = {201} 



e = {023} 



e = {403} 



f = {021} 



/■ = {401} 



9 = {012} 



. ' 9 - {101] 



h = {038} 



h = {304} 



i = {013} 



i = {203} 



p = {311} 



i? = {221} 



The most important of these forms are represented on 

 Fig. 0, Plate III. Among the terminal faces the prism of the 

 third order, n, is predominant; often it is present alone. The 

 fundamental prism ш, however, also frequently occurs, but 

 its faces are subordinate in size, compared to those of the 

 preceding form. The pyramid p is less common , which 

 is also the case with the first pinacoid a, that, besides, always 

 is very narrow. Of the rarest occurrence is the prism I (not 

 represented in the figure), which cannot, like the other planes 

 in this zone, be referred to the hexagonal system. The pre- 

 sence of this form is, however, fully ascertained both on the 

 mineral in the Lützen collection and on the new material. 



Among the forms in the zone of the a-axis the prism of the 

 second order, d, is always predominant. The prisms h and f 

 too, are generally tolerably well developed. The other forms, in 



