TAB. LXXIV. 



ZINCUM sulphuratum. 

 Sulphur et of Zinc, Blench 



Class 3. Metals. Order I. Homogeneous. 

 Gen. Zinc. Spec. Oxygenized. 



Spec. Char. Zinc in combination with sulphur. 

 Syn. Zinc mineralized by sulphur with iron. Kirw. 

 v. 1. 237. 

 Blende, Emmerl. v. 2. 443. Syst. Min. Jameson, 



v. 1. 16. 

 Zinc sulphure. Haiiy, v. 4. 167- 



Blende (commonly called Black Jack by the miners) is 

 often found crystallized, but generally in a very confused 

 manner, and most frequently of a deep jet-black. The 

 tetraedral variety, here figured, has something of a less deep 

 black lustre, and approaches to a lead-like appearance. 

 Except one or two solitary crystals, they are generally in 

 plated clusters or groups ; the plates, for the most part 

 diminishing from the edges to the centre of the triangular 

 faces, forming three faces, as on the dark side of the right 

 hand jignre. Occasionally, each face of the tetraedron will 

 differ ; and one may either be seen plain, as at the base of the 



M 



