£56 Gold schmidt and Nicol — New Forms of Sperrylite. 



25° 05, calculated c m = 25° 14. The same form was 

 observed on crystal No. 4, with three faces, with the posi- 



tions 



Measured. 



P 



133° 18 24° 57 



162° 33 73° 12 



45° 05 25° 26 



Calculated. 



<P P 



135° 00 25° 14 



161° 34 72° 27 



45° 00 25° 14 



This form may be considered as established. 



q = £ (112), after c p e the most important form of sperrylite. 

 It was observed on crystal No. 4 with four faces. The 

 best of these gave the position : 



measured : <^p = 44° 36 ; 35° 12 

 calculated : <j> P = 45° 00 ; 35° 16 



also on crystal No. 1 this form was observed with two 

 uncertain faces, and on crystal No. 5 with five faint faces, 

 the two best of. which gave the position : 



measured: <£pr= 135° 32; 34° 11 

 calculated: <£/>= 135° 00; 35° 16 



measured: <£p==44°30; 34° 08 

 calculated: ^p = 45° 00; 35° 16 



On crystal No. 7 this form appeared with four faint faces 

 and on crystal No. 3 with three faces, the best of which 

 gave the position : 



measured : <£p = 44 36 ; 35° 12 

 calculated : #/> = 45 c 00 ; 35° 16 



It appeared again on crystal No. 9 with four small faces 

 with extended signal reflection. 



B = f (335) observed on several crystals, established, however, 

 only by two faces, one on crystal No. 3 and another small, 

 though good face, on crystal No. 4. 



Crystal 



Measured. 



Calculated. 



No. 



<t> p 



<t> P 



3 



133° 30 39° 56 



135° 00 40° 19 



4 



135° 07 39° 42 



135° 00 40° 19 



It is a poorly developed form. 



u = 1£ (212) observed on crystal No. 1 with one face, on crystal 

 No. 4 with two faces, and on crystal No. 5 with seven faces. 

 Position : 



