Silver. 25* 



of the concentrated nitrous acid ; the filver 

 and copper are feparated as in N* 21. 



SPECIES XI. 



Mineralized by Sulphur and Arfenic^ 'with Iron 

 and Regulus of Antimony. 



Plumofe Silver Ore> Feder ertz. 



26. In point of colour this ore varies from 

 3. dull white to grey, dark blue, brown or 

 black ; it is found in a capillary form, or, 

 like wool, fo.metimes loofe, at other times at- 

 tached, its filaments are rigid and inflexible; 

 the whiter it is, the richer ; but it feldom con- 

 tains even i per cent, of filver. It is found 

 in Saxony and elfewhere. Some confound it 

 with the foregoing. 



Its analyfis may be imderftood from N'. 

 21 and 25. 



SPECIES XII. 



tyLinera]ized by Sulphur and Arfemc-> 'With 

 Cobalt and Iron. 



Cobaltlc Silver Ore. 



27. This ore is diftingulfhed by rofe-co- 

 loured particles, of cobalt difperfed through 

 a dark brown, blackifli, or grey, and fome- 

 what fhining folid mafs. It is found in 



Saxony i 



