244 Elements of Mineralogy. 



called a filver ore, if the arfenic were not 

 eafily diffipated : the quintal contains but 

 from 4 to 6 ounces of filver ; it is very foft, 

 and eafily cut, and when cut has a brilliant 

 metallic appearance ; it confifts of conchoidal 

 laminae ; it is found alfo at t^uadanal- Canal. 

 Mon. Ibid. 



12. It is reduced by evaporating the 

 arfenic, which then leaves the filver flightly 

 contaminated with iron. 



SPECIES V. 



Mineralized by Sulphur and Arfenic. 

 Red Silver Ore, Rothgulden ertz. 



13. This is a heavy, fhining fubftance, 

 either tranfparent or opake, moftly of a 

 crimfon or reddifh colour, though fometimes 

 grey or blackifh, but when fcraped or pow- 

 dered always reddifh ; found either in fhape- 

 lefs mafles, or cryftalized in pyramids or po- 

 lygons, or dendritritical, or plated or radiated 

 incruftations, on or in matrixes of quartz, 

 flint, fpar, pyrites, fparry iron ore, lead ore, 

 pyrites, cobalt ore, jafper, barofelenite, gneifs, 

 &c. when radiated or ftriated, it is called 

 rothgulden blutb. In fire it crackles and melts 

 after it has acquired a red heat, with an arfe- 

 nical fmell ; it detonnates with nitre ; its fpe- 



cific 



