223 PHYSIOGRAPHY. CLASS II. 



p _ 



P -f- oo. (?r + oo) 3 . Fig. 68. Theiss near 

 Brixen, Tyrol. 



S.P_ W . |. *L+1 <!?. Fr. Pr + i. 



_P _(&) _(Pj-)* f 

 ^2' 2 2 



(Pr + oo) 3 . Pr + QD. Fig. 69. Tyrol. 



Pr4 .i .- . 



"' ~" 



2 2 2 2 



P + oo. (pr^oo) 3 . Fig. 70. Tyrol. 



Cleavage very indistinct, parallel to P -f oo, some- 

 what more easily observed f r -f oo. Fracture 



uneven, imperfect conchoidal. Surface, -- 



2 



striated in three directions, parallel to the edges 



p 



of combination with P oo and with __, the 



2 



vertical prisms parallel to their own intersections, 



p 

 Pr and _ rough. The rest of the faces 



2 



generally of nearly the same physical quality, 

 are often altogether rough, or at least devoid of 

 polish. 



