VOL. II. PLATE X. 



FIG. 54. Prismatic Emerald. 



The elevation copied from HAUY, Trait e, 

 2de Ed. PL 72. Fig. 153., the projec- 

 tion from the crystal in the cabinet of 

 M. DE DREE. 



FIG. 55. Prismatic Glauber-salt. 



n T z o M 



Pr + oo. 

 P 



FIG. 56. Prismatic Glauber-salt. 



P-oo. If, Lpr-l.-lf.-Z.. 



22 22 



/ r n y T % 



(Pr)^ Pr + 1 (p)3 



2 2 ~^T' 



v w d 



(Pr -f oo) 5 . ?r 4- OD. Pr + oo. 

 o M P 



FIG. 57. Prismatoidal Gypsum-haloide. 



Pi 



_. P + x. f r -|- OD. 



/ P 



FIG. 58. Prismatoidal Gypsum-haloide. 



*,-**=* pi*4*w- 



9C <^ 



; o / A 



