ORDER XIII. PRISM A.TOIDAL SULPHUR. 47 



and Almaden in Spain. At Idria it occurs in beds of bitumi- 

 nous shale, with black Mineral-resin, andxlark grey sandstone, 

 associated with limestone. It seems that the repositories 

 of Moschellandsberg, Wolfstein, and Almaden, are much 

 of the same nature. The peritomous Ruby-blende is found 

 in veins at Schemnitz, Cremnitz, and Rosenau in Hun- 

 gary, at Horzowitz in Bohemia, and in the Erzberg near 

 Eisenerz in Stiria. The Quicksilver Liver-Ore has been 

 found only at Idria, the bright red Cinnabar at Wolfstein 

 in the Palatinate. Peritomous Ruby-blende is found be- 

 sides in considerable quantities in Mexico and Peru, in 

 China, Japan, &c. ; small quantities are met with in seve- 

 ral countries. 



5. It is used for the extraction of mercury ; but only if 

 very pure, it may be employed as a pigment in its natural 

 state. 



ORDER XIII. SULPHUR. 



GENUS I. SULPHUR. 

 1. PRISMATOIDAL SULPHUR. 



Yellow Orpiment or Prismatoidal Sulphur. JAM. Syst. 

 Vol. III. p. 455. Prismatoidal Sulphur or Yellow 

 Orpiment. Man. p. 293. Orpiment. PHILL. p. 277. 

 Gelbes Rauschgelb. WERJT. Hoffm. H. B. IV. 1. S. 

 220. Rauschgelb. HAUSM. I. S. 208. Auripigment. 

 LEONH. S. 168. Arsenic sulfure jaune. HAU Y. Traite', 

 T. IV. p. 234. Tabl. comp. p. 109. Traite, 2de Ed. T. 

 IV. p. 247. 



Fundamental form. Scalene four-sided pyramid. 

 P = 131 36', 94 20 7 , 105 6'. Vol. I. Fig. 7. AP. 



a : b : c : = 1 : J 0'8 : V 2-2. 



Simple forms. P (P); P + QD = 117 49^ (?r)*; 



(Pr + QD) 5 (u) =. 79 20' ; Pr (o) = 83 37'* 



?r + oo (s) ; Pr + oo. 

 Char, of Comb, Prismatic. 



