Elements of Mineralogy. 

 fure to the air ; it is of a loofe ftru&ure, very 

 brittle, and of a lamellar texture ; its fpecific 

 gravity is 8,310 ; if laid on a red hot iron it 

 burns with a flight flame, white fmoke, and 

 |jarlickfmell, is wholly volatilized, and tinges 

 a plate of copper held over it white ; it is 

 cafily foluble in the nitrous acid, more diffi- 

 cultly in the vitriolic, and fcarce at all in the 

 marine ; boiling oils alfo diflblve it j it der 

 tonates with nitre. 



* 

 SPECIES I. 



Native^ Scherben Cobalt, Fliegenftein, Cobalt 

 teftacL 



2. Of a lead colour, of different degrees 

 of hardnefs, friable, and of a fcaly texture, 

 feldom, if ever, cryftalized ; it poffefles all 

 the properties of the regulu$ above de- 

 fcribed. * 



3. If may be analyfed by folution in aqua 

 regia ; the filver^ if any, will remain preci- 

 pitated j; the iron, of which it commonly 

 contains a fmall proportion, will remain in 

 the folution ; but if a fmall quantity of water 

 be added to the folution, the calx of arfenic 



precipitated, and the iron remain. 



4. Mifpickel, which confifts of arfenjc nearly 

 in a reguline ftate united with jron, has al* 



ready 



