Xanthocobalt

The salts of Xanthocobalt have a dark sherry - wine or brown - yellow color . They are rather more soluble , both in hot and cold water than the salts of Roseocobalt , Purpureocobalt , or Luteocobalt , the solutions when dilute have a yellow color; when concentrated they are dark-brown yellow.

The nitrate of Xanthocobalt, being much less soluble in cold water than the ammonia salts, is easily purified by re-crystallization.

It might be supposed that , because the chloride and nitrate of xanthocobalt directly combine to form the chloro-nitrate , the two salts were isomorphous , and could therefore crystallise together in all proportions ; it is shown, however, by Dana's and Cooke's measurements of the crystals of the nitrate and chloride respectively, the former belongs to the dimetric, and the latter to the trimetric system.