306 Elements of Mineralogy. 



red, and for the moft part cryftalized in 

 rhomboidal paralellipipeds, or irregular pyra- 

 mids. According to Lehman it contains ful- 

 phur, arfenic, and about 34 per cent, of lead, 

 and according to Mr. Pallas alfo filver. 

 Pallas Reife. 2 Theil. p. 274. 



SPECIES IX. 

 Stony orfandy Lead Ore. 



22. This confifts either of the calciform 

 lead ores, or galena, intimately mixed and 

 diffufed through flones or earths chiefly of 

 the calcareous kind. 



23. It is analyfed in the motft ivay in the 

 manner already defcribed, and in the dry way, 

 if the matrix be calcareous, by adding the 

 fluor fpar, or if filiceous, the black flux 

 with a little iron. 



24. Ores of lead are moft frequently found 

 among ftones of the calcareous or barytic 

 genus. 



CHAP. VIII. 



Mercury. 



I. It were fuperfluous to mention its lefs 

 obvious chara&ers, as its liquidity alone fuf- 



ficiently 



