278 
METALS. 85. Ferrum. 
or yellowifh-green, with a dull lullre : it ftains the fingers, 
and biackcns when ilrongly heated : with borax it eafil/ 
melts into a yellowilh- brown opakc glafj with fonic black 
fpots : it is fuppt fed to confift of alumina, filica, manganefe» 
and from 10 to 12 p r cent, of iron. 
arsenicale. Grey or greenifh, not magnetic, emitting arfcnical va- 
pours when thrown on r-.d hot coals. 
Prou/t. avnah de chim. 1. p. igj. 
Phihifoph-pTanfiiii . x'iox. p I go. 
Klaproth, ohfor^-tions- p 29. 
Arfenicated iron ore. Kirnvav mmer. 2. p. 1 89. 
Aifentcal iron ore, Mifnitlf''!. ithmeifscr 2. p. log, 
Arfeniat of iron. Thornton chein. 4 p. 63. 
Arfeniate of iron. &o^trbi Brit min. t. 87. 97. 
Found in the copper mines of Cornmcall vaA in Spain, in final! 
pieces or gener.’lly ciylb.'lized in cubes: colour various 
lhades of giey 01 green : it.s frafture is granular, and it has 
no tranfpaaencv : fpecific g avity from 3.000. to 3,400: it 
contains atfeiiic acid, oxydes of iron and copper, filica and 
water in various proportions. 
\ulphuratum Opake, emitting fulphurous flames and vapours when 
thrown on hot coals. 
Pyiites aquofus. Syst, nat. xii. 3. p. 116. n. 7. 
Suiph. ferio mineralil. WulLjyU.i.p.x'H.n 7. 
Sulphuret of iron, fron pyrites. Sonverlv tab. 29 99. 104,105* 
This combination of iron and fulphur has been alieady deferib- 
ed under the genus Sulphur. ■ 
^hlogisticum O'pa.'kc, of a dufky colour, inflammable. 
Minera feni phlogiftica. Cronft. miner. 160.6, 2, 
Bituminous iron ore. Schmei/ser miner. %. p, 109. 
Found in Hungary and Snveelen, in external appearance refein- 
Wing a piece of coal j texture friable, or rather firm, 
fixed; it quickly kindles and burns with a light flame, lofinB 
fomething of its weight; conolls of bitumen with a little 
tpon, and gives about 30 per cent of the latter. 
