Gold. ^ 23 1 



marine acid, and precipitability from thefe 

 acids in the form of a purple powder by fo- 

 lution of tin, or in a metallic form by the 

 folution of vitriol of iron.- 3 dly ' A yellow, 

 or reddifh yellow colour when in its metallic 

 ftate. 



Gold expofed to the utmoft heat of Mr. 

 Parker's lens for fome hours loft no fenfible part 

 of its weight, yet when in contact with earthy 

 matters, it communicated a blue or purplifh 

 tinge to them, fo that I believe an exceeding 

 minute portion of it was dephlogifticated. 



Gold Ores. 



2. Gold being incapable of uniting with ful- 

 phur, or even with arfenic, but very diffi- 

 cultly and while in fufion, or with fixed 

 air, is for that reafon never found minera- 

 lized, but either native or invifibly mixed 

 with other fubftances. 



SPECIES I. 



Native. 



3. Native gold is found either feparate 

 from any matrix in lumps, or vifible grains 

 mixed with fand, and in this ftate it is found 

 in many rivers in France, Africa^ and elfe- 

 where, or iavifibly difperfed through large 



mafles 



