374 PHYSIOGRAPHY. CLASS n. 



(P + as)* (d) = 157 8' ; (Pr + oo) 5 (it) = 79 

 ljr . + ?r (P) (28 6') _Pr-f-l 

 "2" i#)~~l3218'i' -3- 

 = 16 50' ; Pr . 1 (t) = 110 51' ; Pr + oo (q). 

 Char, of Comb. Hemi-prismatic. Inclination of 

 p oo on Pr + oo = 98 18'. 



Combinations. 1. _. E?. (Pr -jj- oo) 3 . Sim. 



Fig. 1. Arendal, Norway. 



Pr pr Pr + 1 (Pr) 3 ^ 



2. . - .L v !_. Passau. 



2 ^ ^ 2 



3. L r . Z. ?L (Pr + o>). Fig. 47. Arendal. 



rr. r+ oo. StGothard, Switzerland. 

 Cleavage; sometimes distinct in the direction of 



"P "PT ^ T^ ^ 



; less distinct in that of and - ^~- 

 Fracture imperfect conchoidal, uneven. Surface, 



and - ^" almost always faintly streak- 

 ed parallel to the edges of combination with 



T> ^Pr^3 



; 2 at t ^ le same ti me parallel to those 

 with f r 1, with (Pr + oo) 5 , and with its own 

 edges; is often rounded, sometimes 



also . The remaining faces are smooth, 



and often possess high degrees of lustre. 

 Lustre adamantine, sometimes inclining to resinous. 



