MINERALOGY. 231 



then called the blccm or flowers of cobalt. 

 When cobalt and arfenic are melted toge- 

 ther in an open fire, they produce a blue 

 flame. 



g. It does not amalgamate with quickfilver by 

 any means hitherto known. 



b. Nor does it mix with bifmuth, when melted 

 with it, without addition of lome medium 

 to promote their union. 



SECT. CCXLVII. 



The cobalt is mod commonly found in the 

 earth mixed with iron. 

 A. In form of a calx, Cob alt urn c aid for me. 

 1. With iron without arfenic, Martiale abfque 

 arfenico. 



a. Loofe or friable, Mincra cobalti calci- 

 formis pulverulent a. Cobalt ochre, Ochra 

 cobalti nigra* It is black, and like the 

 artificial zafrre. 



b. Indurated, Miner a cobalti calciformis in- 

 duraia. Minera cobalti vitrea^ ihefcblac- 

 ken or flag cobalt. 



This is likewife of a black colour, but 

 of a glafly texture, and feems to have 

 loft that fub (lance which mineralifed it, 

 by being decayed or weathered. It is 

 often confounded with the Scherbenco- 

 bolt, for it is ieldom quite free from ar- 

 fenic •, and there may perhaps exift a pro- 

 greflive feries from the Schlacken kind to 

 the Scherbencobolt kind. 



Q^4 5 E CT, 



