ORDER X. GENERA AND SPECIES. 445 



X. ORDER. PYRITES. 



I. NICKEL-PYRITES. Prismatic. 



Colour copper- red. 

 H. = 5-0 ... 5-5. 

 G. = 7-5 ... 7-7. 



1. PRISMATIC. Prismatic. 

 Cleavage, indistinct. 



Prismatic Nickel Pyrites. J. ii. 446. 



II. ABSENICAL-PYRITES. Prismatic. 



Colour not inclining to red. 

 H. = 5 ... 6-0. 

 G. =5-7... 7-4. 



Colour white or grey : G. under 6*3 or 

 above 7*0. 



1. AXOTOMOUS. Prismatic. Pr = 51 20'. P + co = 



122 26'. 



Cleavage, P co. Less distinct, Pr = 86 10'. Tra- 

 ces of P + oo. 



H. = 5-0 ... 5-5. 



G. = 7'1 ... 7'4. 



Axotomous Arsenical Pyrites. J. ii. 448. 



2. PRISMATIC. Prismatic. 



Cleavage, P cc. (Pr + co) 3 =5 111 53'. 

 H. = 5-5 ... 6-0. 

 G. = 5-7 ... 6-2. 



Prismatic Arsenical Pyrites. J. ii. 449. 



III. COBALT-PYRITES. Tessular. 



Colour white, inclining to steel-grey or red. 



H. = 5-5. 



G. = 6-1 ... 6-6. 



