from the Pyrite s. 293 



only in veins laic; Dare, bur alio in firm, clofe v n- 

 ftone •, if onlv the fmaiicit fiflure happen to give 

 entrance to this penetrating, infatuating body -, and 

 laffjy, in mineral and pyrites heap- work, which is 

 either mot in trunks, or otherwife remains lying 

 in the groove. The nrft may be manifeftly ob- 

 ferved from a view of fuch veins laid bare.; the fe- 

 cond, not only from vitriolic groove- waters and ce- 

 ment-waters, as they are called, which, according 

 to all cireum fiances, muft have their vitriol, not 

 from the contiguous, but from diflant and clofe 

 vein-ftones : a I lb from many day-fprings, fuch .as 

 fcveral medicinal fprings are, which, in places where 

 mines were never worked, carry vitriol along with 

 them out of the earth : the laft we experience very 

 often ) as I have had plenty of fuch pyrites from 

 the Rothe-grube, which I have examined on ac- 

 count of their fpontaneous vitriolifation. 



At the day, or without the groove, they, in 

 various places, become vitriolic \ yet in fome more 

 than in other places -, for in fiance, on that heap, 

 or heap-work of minerals and earth, (hot toge- 

 ther near the groove, and feldom without pyrites ; 

 in vaults, cellars, and the like moift places ; 

 in rooms and cabinets ♦, nay, on floors under 

 roof or cover, according to the nature of the 

 feafon, the weather, and the fituation of the 

 buiidiror But as the action of the air is here 

 too (low to anfwer our occafions for vitriol fpeedily 

 enough, the fire is to be called in aid ; at lead, for 

 the fake of faving time, and on account of many 

 pyrite;, efpecially the copper -pyr it a, which very 

 ilowly yield their contents without its afiiftance > 

 but the fulphur, in this way of vitriolifation, is en- 

 tirely loft. Now, the fire is here applied in three 

 fcveral ways \ either in clofe veffels and furnaces, 

 Vfcercin i\\z pyrites is laid for procuring at the fame 



U 3 time 



