303 
MEXALS* Cobsltnm. 
94. COBALTUM. Bluilh- ^ey with often a ftad'c 
of red, hardifh, very brittle, attrafted by the 
magnet and kfelf convertible inter the magnet^ 
fpeclfic gravity 8, 1 50 : in a red heat gradu- 
ally becoming a blue powder which become^ 
deeper and at laft a deep black- blue, in a violent 
heat burning with a red flame, when fufed with 
borax producing a fine blue glafs : giving a red- 
dilb colour to its folution in nitiic acid, and 
precipitating a blue powder with the addition of 
potafs. 
mgrst.'ri. Jncoiifpicuons, of a Julky colour, emitling no arfenicai 
vapours when thrown on hot coals. 
Cobaltum calciforme. Crmjl. miner . 245, 
Black cobalt. Berkenh. fyn. 269. 
Black oxyde or calx of cobalt. Schmei£er min. z. p. 240. 
Black cobalt ore. Thomfon chem. 4. p, 107. 
1. Friable, of a loofe earthy confiflience. 
Ochra cobalt! nigra. Wall. fyft. 2. f. 1S3. n.j. a. 
Loofc black cobalt ore, Kir^au mineral, 2. p. 275, 
2. Indurated, 
Cobaltum fcoriaceutn. Syft.nat. xW, g, p, izg 4. 
Cobaltum mineralis. Wall.fyji. 2. p. l8o. n- 5. 
Indurated black cobalt ore. Kirnuan miner, z. p-zi<y. 
Found in the mines of Greea.Britaht, Au/iria, Saxony, Hungarjt 
Germany, &c. either in the Bate of a loofe friable powder, or 
in veins, or in corroded botryoidal or kidney form mafiest 
colour various (hades of brown orblaekifh with often a (hade 
of giey or green: when rubbed with the nail it become* 
fliining : it is foluble in muriatic acid : fpecific gravity from 
3 to 4,000. 
efhraeeum, Inconfpicuous, earthy internally, of 3 paler colonfr 
emitting arfenical vapours when thrown on hot coals, 
Ochra fulva. Syft, nat, xii. J. p. 193. ». 8. 
Cobalt, facie terrea. Wall, fist, 2. p. 181. ». 7. 
Brown cobalt ochre. Kinwan miner, z. p, 276. 
Brown earthy oxyde of cobalt. SchmeiJ/er min, 2. p, 241, 
Brown cobalt ore, Tbomfin chem. 4. p, 107. 
