38 PHYSIOGRAPHY. CLASS II. 



4. The varieties of this species occur at Briiunsdorf near 

 Freiberg in Saxony, at Malazka near Posing in Hungary, 

 and at Allemont in Dauphiny in France. The principal 

 localities of Tinder-ore are Clausthal and Andreasberg in 

 the Hartz. 



GENUS IV. RUBY-BLENDE. 



1. RHOMBOHEDEAL RUBY-BLENDE. 



Rhomboidal Ruby-blende or Red Silver. JAM. Syst. 

 Vol. III. p. 425. Man. p. 291. Red Silver. Ruby 

 Silver. PHILL. p. 291. Rothgiltigerz. WERN. Hoffm. 

 H. B. III. 2. S. 67. Rothgiltigerz. HAUSM. I. S. 221. 

 Rothgiiltigerz. LEONH. S. 199. Argent antimonie' 

 sulfure'. HAUY. Traite', T. III. p. 402. Tabl. comp. 

 p. 75. Traite, 2de Ed. T. III. p. 269. 



Fundamental form. Rhombohedron. R = 108 

 18'. Vol. I. Fig. 7. R. G. 



a = V 1-895. 



Simple forms. R oo (o) ; R 2 (*) = 157 

 4& ; R 1 (*) - 137 39' ; R (P) ; R + 1 

 (g, i) = 80 59'; R + oo (fc) ; P + oo (n) ; 

 (P - %y (0 ; (P- I) 5 (a) ; (| P-l)' (b) ; 



Char, of Comb. Rhombohedral. Sometimes the 

 configuration of the opposite apices is different. 

 Of the faces of R + QD often only the alternating 

 ones appear, as in rhombohedral Tourmaline. 



Combinations. l.R 1. P + oo. R + l. 

 R 1. Fig. 182. Andreasberg, Hartz.* 



2. R -1. -y^. P-f OD. Fig. 136. Andreasberg. 

 * In the cabinet of Mr ALLAN. H. 



