238 Elements of Mineralogy. 



Bindhelm lately effayed this ore in a particu- 

 lar manner. The pyrites being well pulve- 

 rifed, were heated in an open crucible, until 

 the fulphur was burnt off. The refiduum 

 while hot, was thrown into water, a reddifh 

 brown matter remained undiffolved. This, 

 when dried, was diverted in 3 times its weight 

 of aqua regia, then diluted and filtered, and 

 aether poured on it and fhaken. The aether 

 took up the gold, and being burnt off, left it 

 in its metallic form, 4 Berl. Scbrijf. 393. 



19. In Peru gold is found mixed with a 

 ftony matter, not well known, and alfo with 

 a red Earth, from both which it is there ex- 

 traded by amalgamation, 2 Jars. 



^ 



CHAP. II. 



Platina. 



1. Platina has as yet been found only 

 among the gold mines of Peru. It comes to 

 us in the form of large fmooth grains, of an 

 irregular figure, iome of them hollow, whiter 

 than iron, intermixed with quartz, and a fer- 

 ruginous fand, and in the cavities, fometimes 

 particles of gold, but more frequently quick- 

 lilver is found, which may be feparated by 

 diftillation ; whence it is conjectured, that it 

 is not brought to us in its natural ftate, but 

 that it has been feparated from gold with other 



matters, 



