^^8 METALS. 85. Ferrum. 



or yellowifh-green, with a dull luftrc : it ftains the fingers, 

 and blackens \>hen ilrongly heated: with borax it eafily 

 melts into a yel'owifh- brown opakc glals with iome black 

 fpots : It is fuppofed to confift of alumina, fiiica, manganefe, 

 and from 10 to 12 per cent, of iron. 



arsenicak^ Grey or greenifh, not magnetic, emitting arfenical va- 

 pours when thrown on red hot coals. 



Prouft. annaL de chim, I. />. 195. 



Phtiofopb^ Tranfaa. I 801 . />. 1 90. 



Jilaprcth. ohfernj iftpvs. p. 29. 



Arfenicatcd iron ore. Kirixan miner, 2. p. 1S9. 



Arfcnical iron ore, Mifpickel. bchmeifser 2. p, 109, 



Arfeniat of iron. Thomjon chem. 4 p. 63. 



Arfeniate of iron. Sotvcrh Brit min. t 87.97. i 



Found in the copper mines of Cornn/call and in Sfiiin, in fmalt |; 

 pieces or gener I'y cryllallized in cubes: colour various 1 

 fhades of grey 01 green: its fraclare is granuUr, and it has i 

 no tranfpaaency : fpecific gravity from 3. coo. to 3,100: it ■ 

 contains arfenic acid, oxydes of iron ar.d copper, iilica and 

 water in various proportions. 



tulphuramm Opalce, emitting fulphiirous flames and vapours whei) 

 thrown on hot coals. 



Pyrites aquofus. Syst., not, xii, 3 p. 116 n. 7. 



Sulph. ferro mineralil. WalLj^a. 7 /". i33-« 7. 



Sulphuret of iron. Iron pyriies. Soivtrbv tab. 29 99. 104,105. 



This combination of iron and fulphur has be,en already defcnb- 

 ed under the genus Su phur. 



phlogisticupt Opake, of a duflcy colour, inflammable. 



Minera ferri phlogiftica. Cronjt. miner. 160.6. 2. 

 Bituminous iron ore. Schmeif^er miner. 2. /. 10.9, 



Found in Hungary and Sivedeny in external appearance refem- 

 bling a piece of coal ; texture friable, or rather firm, or 

 fixed; it quickly kindles and burns with a light flame, lofing 

 fomethmg of its weight; confilh of bitumen with a little 

 jro,n, and gives about 30 per cent of the latter. 



