OHDEH II. PERITOMOUS HAL-BARYTE. 117 



P + oo (M) = 117 19' R. G. ; Pr 1 ; 

 f r + 1 (P) ; r + oo (h). 

 Char, of Comb. Prismatic. 

 Combinations. 1. P. ?r + 1. P + CD. Pr + oo. 



Braunsdorf, Saxony. 



3. P oo. P. Pr -f- 1. P + QD. Pr H- oo. 

 Leogang, Salzburg. 



3. P OD. P 1. P. P + oo. Pr + oo. 

 Leogang. 



4. P oo. P 1. P. Pr+1. P-foD. 

 f r + oo. Fig. 28. Leogang. 



Cleavage. P + <*> rather perfect ; Pr 4- 1 less 

 easily obtained. Faint traces of cleavage ob- 

 servable in the direction of Pr -f- oo, or at least 

 small conchoidal fracture. Fracture in other 

 directions uneven. Surface, P oo often rough, 

 though even, and streaked parallel to the edges 

 of combinations with Pr -f 1. P -|- oo deeply 

 streaked in a horizontal direction, and hence 

 often curved (barrel-shaped prisms). The py- 

 ramids and horizontal prisms smooth ; P some- 

 times streaked parallel to its obtuse terminal 

 edges. 



Lustre vitreous, slightly inclining to resinous upon 

 the uneven faces of fracture. Colour asparagus- 

 green and apple-green ; pale yellowish-brown, 

 yellow and grey ; white. Streak white. Trans- 

 parent ... translucent. 



Brittle. Hardness = 3-5. Sp. Gr. = 3-605, the 

 variety in acicular crystals from Braunsdorf near 

 Freiberg. 



