ORDER VI. PRISMATOIDAL AUGITE-SPAE. 



Combinations. 1. _. . _ _. ?r + oo. Fig. 75. 

 Great St Bernard. 



2 P_-OO ? -Z -!* dV-=Ll>!. 

 2 2* 2' 2 



?r -f- QD. Pr + oo. Dauphiny. 



oo. Pr + oo. Dauphiny. 



2 22 



fr + oo. Fig. 77. Arendal, Norway. 



Cleavage, f r -f- oo perfect; less distinct. 



Fracture uneven. Surface, the horizontal prisms 

 streaked parallel to the short diagonal of P, also 

 P oo and ?r -f oo streaked parallel to their 

 common edges of intersection. In general the 

 faces are smooth. 



Lustre vitreous, inclining to pearly upon perfect 

 faces of cleavage and the corresponding faces of 

 crystallisation. Colour, green and grey preva- 

 lent. Among the most common shades of the 

 first is pistachio-green : in general the green tints 

 are more inclined to yellow than in the two pre- 

 ceding species. The grey colours pass into white 

 and a very pale flesh-red. Streak greyish-white. 

 Semi-transparent .., translucent on the edges. 



