44 PHYSIOGRAPHY. CLASS 11. 



Saxony. It consists only of crystals, and is not accompa- 

 nied by any other nrnera!. * 



3. PERITOMOUS RUBY-BLENDE. 1 



Prismato-rhomboidal Ruby-blende or Cinnabar. JAM. 

 Syst. Vol. III. p. 435. Man. p. 292. Cinnabar. Sul- 

 phuret of Mercury. PHILL. p. 358. Zinnober. Queck- 

 silber-Lebererz. WERN. Hoifm. H. B. III. 2. S. 26. 

 33. Zinnober. Stinkzinnober. Lebererz. HAUSM. I. 

 S. 213. 215. 216. Zinnober. LEOXH. S. 187. Mer- 

 cure sulfure. HAUY. Traite, T. III. p. 437- Tabl. 

 comp. p. 78. Traite, 2de Ed. T. III. p. 313. 



Fundamental form. Hhombohedroq. R = 71 47'. 

 Vol. I. Fig. 7. HAUY. 



a = V 15-75. 



Simple forms. R x (o) ; R 2 (u) = 122 35'; 

 J R 2 0) = 110 6' ; J R 1 (k) = 101 

 59'; R 1 (a)=9236'; R (P) ; R + <x> (I). 



Char, of Comb. RhDmbohedral. 



Combinations. 1. R ^ CD. R-f- x. Almaden,Spain. 



2. R_oo. R 2. |R 2. R. Idria, Carniola. 



3. R x. R 2. R. R + x. Almaden. 



4. R a, R 2. |R 2. |R 1. R 1. 

 R. R -f- x. Fig. 125. Almaden. 



Cleavage, R + x, highly perfect. Fracture con- 

 ch oidal. Surface, the rhombohedrons horizontally 

 streaked, some of them very deeply. 



Lustre adamantine, inclining to metallic in dark 

 coloured varieties. Colour several shades of co- 



* I must here mention a finely crystallised specimen in the 

 possession of Mr BROOKE, which seems to have some proper- 

 ties analogous to the hemi-prismatic Ruby-blende. Yet its 

 combinations appear to be tetarto-prismatic, and may there- 

 fore belong to another species. H. 



