METALS. 94. Cobahum. 303 



z. Dull yellow, with a brighter un£luous ftreak. 

 Yellow cobalt ochre. Kirivan min, 2. p, 277. 

 Yellow OKyde of cobalt. Schmei/jer miner. 2, /. 242, 

 Yellow cobalt ore. Thomfon chem^ 4, p. 107, 



3. Grceii, in the form of minute capillary cryftals, combined with 

 nickel. 

 Green cobalt ore. Kirivan mineral. 2. /• 280. 

 Green oxyde of cobalr. Sch?nei/Jer min, z, p, l^l» 



Found in the mines of Great -Britain and various parts of the 

 continent, generally depofited on other ores, though fome- 

 times found botryoidal or kidney-lhaped : colour various 

 Ihades of brown, reddifh, yeilowifh, green or inclining to 

 blue: it very rcaUily forms a glafs of various (hades of 

 blue, 



C^haltigo, Radiated, red, with a glalTy lufl:re, emitting arfenical va- 

 pours when thrown on hot coals, 

 Ochra puipurea- Syji. nat. xii. 3. ^. 195. n. 15. 

 Cobaltum arfenico. WaU.fyft, z.p. 181. ». 6. 

 Red cobalt ore, Kirivan mineral 2, p, 278, 

 Red oxyde of cobalt. 8<hm£ifs€r»miner.2.. p* 243, 

 Arfeniat of cobalt, Thomfon chem. 4. /. 108. 

 Found near the lakes of Ktllamey in L-eiand^ and in moft places 

 where the other ores of cobalt abound, fometimes maffivc, 

 fometimes in the ftate of flowers: colour various (hades of 

 , red from pale peach-bloiTom red to deep crimfon : fometimes 



it is found dcpofued on different ftones in the form of fmall 

 4-(ided prifmatic cryftds difpofed in a ftellate or radiate man- 

 ner, which are (hining, femitranfparent and foft to the 

 touch : it confifts of cobalt combined with the arfenical acid. 



^irc9rfum* Inconfpicuous, of a dirty mixed colour, when burnt and 



fufed with lead leaving a bead of filver. 



Argentum nativum. Ifail.jyi't. z^ p 345. ». 16. 



Scbreber Bergm. yourn. 1788. 1.^ 43. 



Found in the mines of Norivayy Saxony^ Germany, Hungary and 

 Dauphiny, and contains a mixture of (ilver, iron, fometimes 

 nickel, arfenic, rarely quickfilver, in fuch indeterminate 

 proportions as to make it difficult to fix its genus. 



su^uraium Of a tin-white colour and luftre, emitting fulphurous va- 

 pours when thrown on hot coals, and at length leav- 

 ing a pure oxyde of cobalt, 

 Geyer chem^ annai. 1788. 1. ^.67. 

 Sulphurifed cobalt. Schmetjfer miner, z. p. zy^^ 

 Found in Siueden and Hungary., fometimes maflive, fometimes 

 in cubical cryftals without (Iriae, and is compofed of cobalt 

 and fulphur with arfenic or iron. 



