560 Elements of Mineralogy. 



i r. Mountain Green, is generally found in 

 a loofe and friable ftate, rarely cryftalized and 

 indurated, often mixed with calcareous Earth 

 and iron, andfome arfenic. 100 Parts of the 

 pureft contain 72 of copper, 22 of aerial acid, 

 and 6 of water. 



III. VARIETY. 

 Mountain Blue, Chryfocolla of fame. 



12. This alfo moft frequently appears in 

 a loofe form, but fometimes indurated and 

 even cryftalized, but it is then mixed with 

 quartz. 100 parts of it contain about 69 of 

 copper, 29 of aerial acid, and 2 of water. 

 Mr. Morveaii) in the Memoirs of Dijon, for 

 1782, has fhewn, that the calces of copper 

 are determined rather to a blue than a green 

 colour, by a greater proportion of phlogifton. 



13. They are analyfedin the moid way by 

 folution in acids, and precipitation by the 

 mineral aerated alkali, if they be pure, or by 

 the PruJJian alkali, if they contain earths. 

 194 grains of the precipitate formed by the 

 mineral alkali are equivalent to 100 of cop- 

 per in its metallic ftate : fo alfo are 350 gr. 

 of the precipitate formed by the Pruffian 

 alkali, as Mr. Bergman has determined : 

 copper alfo may be precipitated in its metallic 



ftate 



