ORDER XI. PBISMATOIDAL ANTIMONY-GLANCE. 23 



which traverse porphyry, several of them at a short dis- 

 tance from each other and parallel. It is accompanied by 

 hexahedral Gold and rhombohedral Quartz, rarely by pris- 

 matic Tellurium-glance. It is occasionally met with along 

 with the latter, at Nagyag in Transylvania. 



4. It is a valuable ore, on account of its contents of gold 

 and silver. 



2. PRISMATOIDAL ANTIMONY-GLANCE. 



Prismatic Antimony-Glance or Grey Antimony. JAM. 

 Syst. Vol. III. p. 390. Man. p. 285. Grey Antimony. 

 Sulphuret of Antimony. PHILL. p. 329. Grauspies- 

 glaserz. WERN. Hoffm. H. B. IV. 1. S. 102. Grau- 



spiessglanzerz. HAUSM. I. S. 194. Antimonglanz. S. 

 152. Antimoine sulfure. HAUY. Traite, T. IV. p. 

 264. TabL comp.p. 112. Traite', 2deEd. T. IV. p. 291. 



Fundamental form. Scalene four-sided pyramid. 

 P = 109 16', 108 10', 110 59'. Vol. 1. Fig. 

 9. R. G. 



a : b : c = 1 : V 0-9577 : V 0'9327- 



Simple forms. J P 2 (s) ; P (P) ; P + oo (m) 

 = 90 45'; (| Pr 2) 5 (e) ; (| ?r 2) 7 (b) ; 

 Pr !() = 127 51'; Pr + oo (o). 



Char, of Comb. Prismatic. 



Combinations. 1. f P 2. P + oo. ?r -f oo. 



2. P. P + oo. ?r + oo. Both similar to Fig. 6. 



3. p. (4 p r 2) 7 . P + QD. Pr -f QD. 



4. P 2. ?r 1. (i Pr 2) 3 . P. 

 (i*r - 2) 7 . P + oo. ?r + oo. Fig. 32. 

 All of them from Felsobanya, Hungary. 



Cleavage, highly perfect in the direction of Pr + oo ; 

 less distinct P QD, P -J- oo and Pr -f- oo, some- 

 times pretty easily obtained. Fracture small 

 conchoidal, rather imperfect. Surface, the ver- 



