304 METALS. 94. Cobaltum. 



fjriticosust^ Of a fteel-white colour and luftre^ emitting fulphurous 



vapours before the blowpipe, and when heated with 

 powdered charcoal leaving a magnetic bead. 



Cobaimm fern min. Syjiy w^/. xii. 3./. 129. n 2, 

 Cobaltum ferro min. Wall lyn^ 2. -p. 178. «. 3. 

 White cobalt ore. Kirivan mifter. 2. p* 273. 

 Whire cobalt ore. Schmefser miner. 2. p. 237, 

 White cobalt ore. ^ homfon chen:, 4. p. 105. 



Foand in the mines of 5-u;^^<?;?, Hungary, Saxony^ Bohemia, &c. 

 luaiUvc, difTen-inated, coating, jpecular, nodular, corroded, 

 or crvilallized in fmall 4.iided prifms or cubes or double 

 Quadrangular pyramids: colour tin white, often tarni (bed: 

 texture generally iine grained, rarely ftriated or divergently 

 fibrous : fp^cific gravity frorii 6,284. to 6,450 : contains co- 

 balt combined with fulphur ard iron. 



ojsfAHi* Of a bluIHi-tin colour ajul luftre, emitting fulphurous and 

 «««?• arfenica! vapours befjie ihe blowpipe and leaving a 



magnetic bead. 



Cobalt, cryftallifat, Syifr. nat. xii. 3. p, 129. «, x, 

 Cobaltum ferro, &c. Wall Jyfl^ 2. p xjd^ n i, 

 Crvll:*l!ine cobalt ore. Berkenh. fyn p. 269. 

 Grey cobalt ore. Schir.ei/Jer min, 2. p^ t^^, 

 Dall grey cobalt ore. Kiriuan ?/iin 2. p 270. 

 Grey cobalt ore. Thomfon chem. 4. p. 106. 



Found in the mines of Cornwall znd various parts of Europe, of 

 3L dull grey col ur with the furface often tarnifhcd : the cryf- 

 talsare ufually 6-fided prifms terminated at each end by an 

 irregular 6-fided pyramid, fo that the cryftal confifts of 6 

 tetragons and 12 hexagons, with the faces llriate in an oppo- 

 fire manner; it confilts of cobalt combined witharfenic, ful- 

 phur and iron in various modifications. 



Mn e a tca l r m Of a dull (leel-grey colour and luftre, emitting arfenical 

 vapours before ^the blowpipe and leaving a magnetic 

 bead. 



C6bsltum ferro. Sec. Sy/l. nat. xii, 3. p. 129. 

 Cobaltum ferro, Sec. Wall, fy ft. 2. p. lyj. «. 2. 



Foand In the mines of Europe, accompanying the other cobalt 

 orc5, of a granular texture approaching to the flat or con-'' 

 choidal, rarely fibrous in a parallel llcllate or fafcicled man- 

 ner, of a common or botryoidal form, fometimes marked 

 with black fhrublike lines: it refembles the lail fpecies ex- 

 cept that it contains Utile or no fulphur. 



