138 PHYSIOGRAPHY. 



Cobaltine Cobalt Vitriol. 



Brittle. Hardness = 5-5. Sp. gr. = 6-298. 

 Compound Varieties. Massive : composition granular, 

 generally small, but easily discernible. 



1. Before the blow-pipe, upon charcoal, it gives a large quantity of 

 arsenical fumes, and melts only, after having been roasted. It imparts a 

 blue color to borax and other fluxes. It affords a pink solution with ni- 

 tric acid, leaving a white residue, which is itself dissolved on further 

 digestion. 



2. Analysis. 



3. It occurs in beds in primitive rocks, and in veins. It is accompa- 

 nied chiefly by Iron Pyrites, Mispickel, and Copper Pyrites ; in beds, 

 it is also associated with Magnetic Iron-Ore, Pyroxene, Hornblende, 

 and Feldspar ; in veins it is sometimes found with limestone and Heavy- 

 Spar. The crystals found in beds are terminated on all sides. 



4. This species occurs in the parish of Modum in Norway, at Tuna- 

 berg in Siidermanland in Sweden, at Querbach in Silesia, and Bottallack 

 near St. Just in Cornwall. 



5. It is a valuable ore of cobalt, which metal is employed for painting 

 in porcelain and the manufacture of smalt. 



COBALT VITRIOL. Staphyline Vitriol- Salt. 



Stalactitic and coralloidal shapes : composition columnar, 

 in most cases impalpable. Friable. 



Lustre vitreous : in very thin columnar compositions, it 

 becomes pearly. Color flesh-red and rose-red . ..reddish 

 white. Semi-transparent . . . translucent. 



Taste astringent. 



1 1. It communicates to borax a blue color; and is soluble in water. 



