PHYSIOGRAPHY. 



Brochantite Bronzhe. 



BROCHANTITE. Prism atoi d al Vitriol-Salt. 

 Primary form. Right rhombic prism. M on M' 117. 



Secondary form. 



Fig. 78. 



Cleavage ; traces parallel to m. Surface m blackish and 

 dull, the remaining faces smooth and shining. 

 Color emerald green. Transparent. 

 Hardness =3-5 . . . 4-0, nearly. Sp. gr. == 3*7 ... 3-8. 



1. Analysis. 

 By MAGJVTJS. 



Sulphuric acid . . . 17-426 



Oxide of copper . . . 66-935 



Water . . . 11-917 



Oxide of tin . . . 3-145 



Oxide of lead . . . 1-048 



2. It is found in small, but well denned crystals, on Green Malachite, 

 at Ekatherinburg, Siberia; also in a pulverulent form in France and 

 Hungary. 



BRONZITE. Hemi-prismatic Sch iller- Spar. 

 MOHS. 



Primary form. Oblique rhombic prism/ Mon M 7 94. C. 



Cleavage ; parallel with P very perfect, though in gene- 

 ral a little curved ; and sometimes having almost impercep- 

 tible layers of Calcareous Spar interposed between the la- 

 minae. In the direction of M and M 7 less distinct ; with 

 traces also in to the diagonals of the cleavage form. Frac- 

 ture uneven and splintery. 



