METALS. 8r.' Aurum. 247 
“’'tnarium. Combined with grains or particles of fand dr other fub- 
ftances, and giving them a golden fplendour. 
Arena aurea, Sjst, nal. xii. 3. p. 198. n. iz. 
Aurum ten:B. Wall. fyfi. r. p- 'i- .. -n j 
Found in many rivers of South Amtrtca and the aojacent lilands, 
in Africa, Arabia, India, and many parts of Europe, more or 
lefs ponderous, and containing gold in greater or lefs quan- 
titles, fometimea fo fmall as not to be worth working : the 
particles of gold may be feparated by means of quickfilver or 
the nitro muriatic acid. 
^ttrvatum. Intermixed with other foflils in very minute particles, 
which are ieparable by means of tjuickfilver. 
Aurum larvatum. SchmeiJJ'er mineral. Z.p. 2 
Found in the mines of Siberia, 7 ranfhania, Hungary, Saxony, 
Sweden, and America, combined with chalk, fpar, alumina, 
Ihillofe porphyry, jafper, quartz, antimony, arfenic, &c. 
and is fometimes made whitifli 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. 
flatinatum. Yellowifh-grey, in fmall grains, harder and heavier than 
pure gold. 
Gold alloyed with Platina. Schmeiffer miner. 2.p. zb. 
Fou-'d ■Jspanijh America, in fmall grains, involved in the pla- 
tina and may be difunited by diffolving the platina m 
nitro-muriatic acid and adding muriate of ammonia which 
precipitrtes the platina and leaves the gold in folution. 
‘^'cgentife- 
t'um. 
Of a pale yellow colour, lighter than pure gold. 
Areentiferous gold. Schmeijfer mineral, z. p. zj. 
Found in moft gold mines, lometimes combined with nearly a 
fourth part of filver, in fmall particles or laminm, filaments 
or 6-fided plates, Lldomin large pieces, but ufually difpcrled 
through certain Hones : it may be feparated by digefting it 
with nitric acid which takes up the filver, and leaves the gold 
behind. 
^olybdeni. 
ftibiatum,' 
I 
Staining the fingers, of a lead colour and loftre, emitting 
flame and fulphurous vapours when burnt, and in a 
very violent heat leaving a button of pure gold. 
Aurum molybd- mineralis. Born jnd.fofi. i - p. b^. 
Found in the mines of Nagyag in Tranff-van.a, and m thofe of 
ILeary near Ki-naccombat, and coufifts of various proportions 
of gold, oxyde of molybdainum and fulphur. 
Of a fteel-yellow colour, 
and flame with a white 
nefs. 
emitting fulphurous vapours 
fmoke when heated to white- 
