VOL. II. PLATE XV. 



FIG. 78. Hemi-prismatic Habroneme-malachite. 

 . ?. r . P + OD. Pr + QD. |pr + oo}. 



p M s 



FIG. 79. Prismatic Feld-spar. 



Pr P ^r + _ fc (f r } 

 2 2 ^ 2 V 



x s y P T I 



M 



FIG. 80. Prismatic Feld-spar. 



y P T I M 



|r Pr + OD : f r + oo. Pr + QD}. 

 FIG. 81. Prismatic Feld-spar. 



y P T I M 



jZPr+oo : ?r + 00. Pr+oo}. 

 FIG. 82. Prismatic Disthene-spar. 



P T 7 Jlf 



FIG. 83. Tetarto-prismatic Vitriol-salt. 



