220 Of the Gold 



But it will be alledged, the copper pyrites, and 

 rites-copper-ores, as copper is nearer allied to gold 

 than iron, yield fome gold; yet with thefe, after 

 all my labour and trouble, I iucceeded no better. 

 It may indeed happen, that fome Hungarian forts, 

 which have ferved to fet the world a-gog after cop- 

 per-pyrites, mall give fome evidence of their con- 

 taining gold -, but of thefe hereafter. One would 

 not readily fuppofe gold to be in the white or arfe- 

 nic pyrites^ feeing it does not appear yellow, but 

 of a filver white, which is the reafon the beautiful 

 yellow pyrites have been pitched upon, though that 

 yellow call be only owing to their fulphur, and 

 afterwards heightened by the copper, nay, often 

 fuperficial only -, and as little from the colour muft 

 we imagine filver in the white pyrites ; though it 

 contains Rich powers, that, under a due dofing 

 with other matters, may contribute fomething to- 

 wards the eduction of both filver and gold. 



From the feveral proofs I have made of a vari- 

 ety of pyrites from different parts of Germany and 

 Hungary, I have found, that the fort yielding gold 

 have had either tender and unobferved eyes of richer 

 ores, efpecially rich filver- ore, or fpangles of na- 

 tive gold, or fome quartz (in which gold general- 

 ly lodges, and not in pyrites) entangled and mixed 

 with the fample under examination ; and therefore, 

 before ever the fample be beat quite fine, and 

 committed to the furnace, it is highly neceffary 

 carefully to infpect it both by the naked and armed 

 eye, and to omit making no experiment that may 

 contribute to difcover it, as gold may lie concealed 

 in the tenderer!: fpangles and dull: : as (i.) igni- 

 tion, whereby the gold is not only heightened in 

 colour, efpecially whea it happens to be fmutted, 



or, 



