OfiDER II. DI-PRISMATIC HAL-UAllYTE. 119 



3. It was first discovered at Strontian in Argyleshire in 

 Scotland, and found afterwards at Braunsdorf in Saxony, 

 in large crystals at Leogang in Salzburg, and also in Peru* 



2. DI-PEISMATIC HAL-BAEYTE. 



Rhomboidal Baryte or Witherite. JAM. Syst. Vol. II. 

 p. 394. Di-prismatic Baryte or Witherite. Man. p. 

 70. Witherite. Carbonate of Barytes. PHILL. p. 182. 

 Witherit. WERN. Hoffm. H. B. III. 1. S. 150. Wi- 

 therit. HAUSM. III. S. 1004. Kohlensaurer Baryt. 

 LEOSTH. S. 613. Baryte carbonate'e. HAUY. Traite', 

 T. II. p. 308. Tabl. conip. n, 13. Traite', 2de Ed. T. 

 II. p. 25. 



Fundamental form. Scalene four-sided pyramid, 

 of unknown dimensions. Vol. I. Fig. 9. 



Simple forms. P x (o) ; P ; P + oo (M ) = 

 118 30' PHILL. ; Pr 1 (x) ; f r (P); r + 1 

 (*) * ; Pr + oo (h). 



Char, of Comb. Prismatic. 



Combinations. 1. Pr. P -f- oo. P r -}- oo. Sim. 

 Fig. 9. 



2. P. Pr + 1. P+ oo. fr + oo. 



3. P CD. P. Pr+1. P -I- oo. Pr -f 00. 



4. p r 1. Pr. Pr-f-1. P + x. Pr + oo. 

 Sim. Fig. S3. All of them from Anglesark, 

 Lancashire. 



Cleavage. Pr + oo, P -f- x and Pr + 1, imper- 

 fect ; the last of these difficultly observed. Frac- 

 ture uneven, Surface of P + oo horizontally 



* Inclination of these prisms to r + co = 110 30', 126 16', 

 and 145 30', according to PHILLIPS. H. 



