RED VITRIOL. 145 



Not very brittle. Hardness =r 2-5... 3-0. Sp. Gr. 

 = 4-192. 



Before the blowpipe it deflagrates, and emits arsenical 

 vapours. According to CHENEVIX, it consists of 

 Oxide of Copper 54-00. 

 Arsenic Acid 30-00. 

 Water 16-00. 



It has hitherto been found only in Cornwall, with several 

 other species of the order Malachite, also with pyramidal 

 Copper-pyrites, rhombohedral Quartz, &c. 



EED VITRIOL OR SULPHATE OF COBALT. 



SALT. 



Red Vitriol or Sulphate of Cobalt. JAM. Syst. Vol. III. 

 p. 23. Man. p. 15. Red Vitriol. Sulphat of Cobalt. 

 PHILL. p. 282. 



Hemi-prismatic. Similar to the forms of the hemi- 

 prismatic Vitriol-salt, MITSCHERLICH. Stalactitic 

 and coralloidal shapes : composition columnar, 

 in most cases impalpable. Friable. 



Lustre vitreous ; in very thin columnar compositions 

 it becomes pearly. Colour flesh-red and rose- 

 red . . . reddish-white. Semi-transparent . . . trans- 

 lucent. 



Taste astringent. 



It is soluble in water. To glass of borax it communi- 

 cates a blue colour. According to KOPP, it consists of 

 Oxide of Cobalt 3871. 

 Sulphuric Acid 19-74. 

 Water 41-55. 



It occurs in the rubbish of old mines, at Bieber in the 

 neighbourhood of Hanau. 

 VOL. in. K 



