PHYSIOGRAPHY. 87 



Olivenite. 



OLIVENITE. Prismatic C o p p e r-B a ry te. 



Primary form. Right rhombic prism. M on M = 

 1JO 50'. 



Secondary form. 



Fig. 328. 



M on a - 132 V 



c on c, over P - 92 30 



Cleavage, traces parallel to M and c, the former being 

 a little more distinct. Fracture conchoidal, uneven. Sur- 

 face, M concave, c convex. 



Lustre adamantine, indistinct. Color, various shades of 

 olive-green, passing into leek-green, pistachio-green, and 

 blackish green ; into liver-brown and wood-brown, or also 

 into siskin-green. Streak olive-green . . . brown. Semi- 

 transparent . . . opake. 



Brittle. Hardness =3-0. Sp. gr. =4-2809. 



Compound F'arieties. Globular and reniform shapes; 

 surface rough, sometimes drusy ; composition columnar, 

 generally very perfect, straight and divergent, rarely pro- 

 miscuous. If the composition be very thin, the lustre be- 

 comes pearly. Massive : composition columnar. Some- 

 times repeated composition; granular and columnar; curved 

 lamellar and columnar. The faces of the first composition 

 rough, of the second composition, smooth. 



1. Heated along before the blowpipe, it remains unchanged. Upon 

 charcoal, it melts with a kiijd of deflagration, and is reduced. A white 



