METALS. 8i. Aurum. 247 



mnnareum* Combined with grains or particles of fand or other fub- 

 flances, and giving them a golden, fpkndonr. 



Arena aurea, Syst^ nat. xii. 3. ;>. 198, «. 12, 



Aurum terra;. Wall.fyd, 2. p. 358. n, 5. 



Found in mdny rivers o{ South Jmerica zr\6 the adjacent iflands, 

 in Africa^ Arabiay Indiui and many parts oi Europe t mors or 

 lefs ponderous, and containing gold in greater or lefs quan- 

 tities, fometimes fo fmall as not to be worth working : the 

 particles of gold may be feparated by means of quickfilver or 

 the nirro muriatic acid. 



Urvatum, Intermixed with other foflils in very minute particles, 



which are feparablc by means of quicklilver. 



Aurum larvatum. SchmeiJ/'er mineral, i.p. 25. 



Found in the mines of Siberia, Tranfylvania^ Hungaryiy Saxofjy, 

 Sivedetiy and America, combined with chalk, fpar, alumina, 

 fhiftofe porphyry, jafper, quartz, antimony, arfenic, &c, 

 and is fometimes made whitifh by various combinations of 

 lead, fpatofe iron ore or fulphate of iron, copper or filver: 

 the particles of gold are rarely vifible to the naked eye. 



Pktinatum. Yellowifli-grey, in fmall grains, harder and heavier than 

 pure gold. 



Gold alloyed with Platina, Schmeiffm- miner. 2, p, 26. 



Found in Spanijh America^ in fmall grains, involved in the pla- 

 tina, and may be difunited by diflblving the platina in 

 nitro-muriatic acid and adding muriate of ammonia which 

 precipitrtes the platina and leaves the gold in folution, 



urgentift' Of a pale yellow colour, lighter than pure gold. 

 rum. Argentiferous gold. Schmeijfer mineral. 2* p. 27. 



Found in moft gold mines, lometimes combined with nearly x 

 fourth part of filver, in fmall particles or laminse, filaments 

 or 6-lided plates, feldomin large pieces, but ufually difperfed 

 through certain ftones : it may be feparated by digetting it 

 with nitric acid which takes up the filver, and leaves the gold 

 behind. 



Moljbdeni, Staining the fingers, of a lead colour and luftre, emitting 



flame and fulphurous vapours when burnt, and in a 

 very violent heat leaving a button of pure gold. 



Aurum molybd. mineralis. Born. ind./ofs» i.p,6S. 



Found in the mines of Nagyag in Tranfylnjania, and in thofe of 

 Hungary near Rimazombatj and confifts of various proportions 

 of gold, oxyde of molybdsenum and fulphur. 



stihiatum,^ Of a fteel-yellow colour, emitting fulphurous vapours 

 and flame with a white fmoke when heated to white- 

 nefs. 



