4 5 The BEDS 



Tin- ore, at firft fight, feems to have fome, tho' 

 a diflant relation to pyrites, by its partaking of 

 arfenic, whereby the tin or metal lodged therein 

 is reduced to an ore ftate ; and in this refpecl:, the 

 white pyrites or the mifspickel is nearly allied to it. 

 But to fhew any fulphur, which is the principal 

 characleriilic of the pyrites, in pure tin-ore is a 

 very difficult matter. Notwithstanding which, the 

 pyrites does notforgoe its natural privilege of being 

 univerfally prefent, as it every where joins itielf to 

 tin ore: and iron-ftone refembles it fo very much, 

 as fcarcely to be diftingui fried from it by the fharp- 

 eft eye •, fo that a feparation muff be made by the 

 magnet : and yet, what is remarkable, iron, which 

 is fo hard and flubborn, and alio copper, incor- 

 porates with tin, which is fo fbft a metal \ and 

 thus may the pyrites in its metal-earth be confidered, 

 as eafily combinable with tin ; tho' by that means 

 the tin be rendred fomewhat hard, and in the lan- 

 guage of the tin-workers, thorney , whence the 

 Engliffi tin, which equally with its ore, is free 

 from iron, is fo univerfally efteemed. 



That pyrites lodges with antimony-ores appears 

 from the antimonial filver-groove at Braunldorff. 

 In which mofl of the ore, together with the in- 

 terfperfed red-goldifh ore, and fome hair, alfo fome 

 foil filver, confids of an arfenjcal pyrites, with a 

 little copper ore : and the entire vein, which in 

 many places is abov„ j a fathom mighty, as miners 

 fpeak, or thick, is throughout fo charged with an- 

 timony, that the whole of it may properly enough 

 be called an antimony ore. And it may here be 

 affirmed, that tho' iron, the firft principle of the 

 pyrites, may fairer tin, yet by no means will it the 

 regulus, which is the principal part of the an- 

 timony. 



The pyrites is alfo prefent with the ore of quick- 

 fiiver, particularly cinnabar, as in the matter of 



their 



