74 PHYSIOGEAFHY. CLASS 11. 



Fundamental form. Rhombohedron. R = 88 41'. 

 Vol. I. Fig. 7. R. G. 



a = J 4-8245. 



Simple forms. R oo (P) ; R 1 (a) ; 11 (s) ; 

 R + 1 ; R + oo (e) ; P 1 (r) = 157 33', 

 45 49' ; P O) = 142 20', 80 25' ; P + 1 (2) 



= 129 1', 118 48' ; P + oo (3/) ; (P)* (w) ; 



141 47' 12"; (P + <x) 3 (/) = 141 47' 12", 



158 12' 48". 

 Char, of Comb. R + n dirhombohedral. (P + n') m , 



hemi-dirhombohedral with parallel faces. 2 (R) 



= 131 14', 111 20'. 



Combinations. 1. R OD. P + GO. Greiner, 

 Salzburg. 



2. P. P + CD. Cabo de Gata, Spain. 



3. P 1. 2 (R). P + oo. Ehrenfriedersdorf, 

 Saxony. 



4. R CD. P 1. P + QD. Fig.110. Ehren- 

 friedersdorf, Saxony. 



5. R o>. 2(R 1). P. 2(R). P+l. 



R + ao 



r 2 r 2 



Fig. 148. St. Gotthard. 

 6. R oo. P 1. 2 (R 1). P. 2 (R). 



P + l. . . R + oo. 



r 2 r 2 



P + oo. Fig. 149. St. Gotthard. 

 Cleavage. R oo and P + oo, not perfect, the lat- 



