476 



BULLETIN 131, UNITED STATES NATIONAL MUSEUM 



and 2>(m) with narrow faces of e(011) and minute faces of the 

 prisms /3(230) and 2(120). 



Another specimen from the 150 foot level of the Old Scott mine 

 contains larger pale yellow wulfenite crystals in pale yellow ocher 

 associated with wad. The best of these was measured and found to 

 show, in addition to c(001), p(lll), and 5(113), faces indicating 



167 168 



Figs. 167-168.— 167, Wulfenite. Old Scott mine, Fremont County. 168, Wulfenite. 



mine, Lemhi County 



Lena Delta 



new or vicinal forms giving the indices (117), (1.10.50), and (0.5.11) 

 (fig. 164). Another crystal is bounded by 5(113) and narrow faces 

 of p(lll) with the corners beveled by a form giving the indices 

 (038) (fig. 167). Still another crystal showing c(001), p(lll), and 

 ^(Oll), has small faces of m(110), and another new form (121) (fig. 

 169). This makes a total of 5 forms on crystals from this locality 

 which could not be correlated with established forms for the species. 

 These may be stated, with their angles, as follows: 



(1) Form measured ^=26 14 p = 74 15 



(121) calculated v=26 34 p = 74 10 



(2) Form measured *>= 41 p = 30 32 



(038) calculated _. <p= 00 p = 30 36 



(3) Form measured v=45 00 p = 17 00 



(117) calculated *>=45 00 p=17 40 



(4) Form measured <p= 5 27 p=17 30 



(1.10.50) calculated *>= 5 42 p=17 37 



(5) Form measured <p= 00 p = 35 42 



(0.5.11) calculated ?= 00 p = 35 39 



All of the forms noted on crystals from this locality with their 

 angles are given in the following table: 



