246 Elements of Mineralogy. 



SPECIES VI. 



Mineralized by Sulpur, and a very frnall For* 

 tion of Arfenic and Iron. 



Slack Silver Ore. Schwartz ertz^ Schwartz 

 gulden. Silber mulm. 



16. This is either of nfolid and brittle con- 

 fidence, which diftinguifhes it from the 

 vitreous ore, and of a glafly appearance in 

 its fra&ure when recent, or of a loofer texture, 

 and footy or deep black colour, like mofs or 

 thin leaves lying on the furface of other filver 

 ores, or of thofe of lead or cobalt, or in clays, 

 ponderous fpar, gneifs, &c. it may contain 

 about 25 per cent, of filver : the former is 

 found in Dauphine, Hungary, and Saxony^ 

 and contains at moft 60 per cent, of filver. 

 Mon. Mineral. 302. 3 Lin. von. Gmel. 406. 



SPECIES VII. 



Mineralized by Arfenic y and containing a large 

 Proportion of Iron. 



Arfenicomartial Silver Ore, Weifs ertz. Py- 

 rites Argenteus of HenckeL 



17. Mineralogifts do not well agree about 

 the ore to which this denomination belongs. 

 I follow Mr. Monnety who feems to have at- 



tende^ 



