Lead. 299 



calcareous earth and argill. Jacquirts Mifcell. 

 157. 3 Roz. 348. both grow red or yellowifh 

 when fufficiently tieated. They effervefce 

 with acids, and afFord from 60 to 80 or 90 

 per cent, of lead ; both are found in Brittany ' 9 

 Lorrain, Germany, and England. 



II. VARIETY. 



Red, Bro<wn, cr Telloiv. 



5. This is alfo found either regularly 

 cryftalized, or in fhapelefs maflfes,or in powder. 

 It differs from the former only by containing 

 more iron. That in powder contains a mix- 

 ture of clay. It affords about 70 or 80 per 

 cent, of lead, 



III. VARIETY. 



Green* 



6. Either cryftalized in needles as in 

 Brittany, or in a loofe powder as in Saxony* 

 but moftly adhering to, or invefting quartz. 

 It owes its colour to iron, and feldom con* 

 tains copper. 3 Lin. Von Gmet. 225. 10 

 Roz. 375. 



IV. VARIETY* 

 Blul/h. 



7. This is alfo fometimes cryftalized, fome- 



times 



