130 PHYSIOGRAPHY. CLASS II. 



blue varieties in plates, consisting of thin columnar compo- 

 sition, are found at Dornburg near Jena, at Frankstown in 

 Pennsylvania, and in France; the compact Celestine is 

 a product of the tertiary gypsum of Montmartre near Pa- 

 ris. In the Vicentine it is very frequently found in vesi- 

 cular cavities of amygdaloidal rocks. 



GENUS V. LEAD-BARYTE. 

 1. DI-PRISMATIC LEAD-BARYTE. 



Di-prismatic Lead-Spar. JAM. Syst. Vol. II. p. 37C. 

 Man. p. 81. Carbonate of Lead. PHILL. p. 338. 

 Schwarzbleierz. Weissbleierz. Bleierde. WERK. Hoffm. 

 H. B. IV. 1. S. 18. 21. 44. Bleiweiss. Bleischwiirze. 

 HAUSM.HI. p. 1107-1111. KohlensauresBlei.LEONH. 

 S. 240. Plomb carbonate'. HAUY. Trait^, T. III. p. 

 475. Tabl. comp. p. 81. Traite', 2de Ed. T. III. p. 3G5. 



Fundamental form. Scalene four-sided pyramid. 

 P = 130 0', 108 28', 92 19'. Vol. I. Fig. 9. 

 R. G. 



a : b : c = 1 : V 2-6865 : J 1-4047. 



Simple forms. P oo (g) ; P I (w) ; P (t) ; 

 P + oo (P) = 108 16' ; (Pr) 5 ( ; (Pr + oo) 5 

 (u) = 69 20'; (Pr) 5 (o) ; (Pr + oo) 5 (*) = 

 140 15' ; f f r = 139 47' ; Pr (M) = 117 

 13'; | Pr -}- 2 (e) = 57 17'; Pr + oo (/) ; 

 Pr +!(/) = 61 18' ; Pr + OD (h). 



Char, of Comb. Prismatic. 



Combinations. 1. P. (Pr + oo) 5 . Mies, Bohemia. 



2. f r. (Pr-f-oo) 5 . Sim. Fig. 2. Nertschinsk, 

 Siberia. 



3. Pr. (]Pr+oo) 5 . P r + GD. Sim. Fig. 9. Jo- 

 hanngeorgenstadt, Saxony. 



4. f r. P. (Pr + QD) 5 . (Pr + oo) 5 . Pr + x. 



