15% 



Mercury. 



Cinnabar. 



Galena. 



Carbonate of 

 lead. 



Arseniated 

 lead. 



Phosphated 

 lead. 



Molybdate of 

 lead. 



Gray copper 

 ore. 



Cdpper py- 

 rites. 



Carbonate of 

 copper. 



Nickel. 



MINERALOGY OF CttALANCHfcS. 



but it is seldom if ever visible in these ores, and only to be 

 detected by an assay. 



Mercury has been found here native but once. It was in 

 a calcareous gangue, coloured by sulphuret of mercury and 

 oxide of manganese. 



Sulphuret of mercury is very common among- the argen- 

 tiferous ores. Frequently it is so concealed by the" oxides 

 of iron, manganese, and cobalt, that it is only to be found 

 by assaying. It occurs likewise with the sulphurets of zinc 

 and lead, and some others. 



Sulphuret of lead is not abundant, but, when it does oc- 

 cur, it is moft commonly very rich in silver. It is frequently 

 iridescent. 



Carbonate of lead is very rare. It is found in the cavities of 

 sulphuret of lead, quartz, and some argentiferous ores. It 

 is seldom crystallized ; and when it is, it has the trihexae- 

 dral form. Most commonly it is acicular, and sometimes 

 earthy. 



Arseniated lead is found pulverulent or earthy in cavities 

 of sulpheuret of lead. It is but rare. 



Phosphated lead sometimes occurs in small, fine, distinct 

 fieedles of a yellowish green colour, on the surface of sul- 

 phuretted lead that is full of hollows. 



Molybdate of lead was found by Schreiber at the foot of 

 the mountain, near the cascade of Batou, after a great 

 landslip. It is in a fine greenish schistous hornblende rock 

 mixed with feldspar, intersected by small veins of green 

 epidote, frequently crystallized in fine transparent needles. 

 Among these needles the molybdate of lead is found. 



Gray copper ore is very abundant, but never crystallized. 

 It is commonly very rich in silver; and among the combi- 

 nations for which it appears to have a preference is that of 

 silky asbestus. 



Pyritous copper sometimes constitutes veins of itself. A 

 few of these were auriferous. 



Green carbonate of copper is frequent in the argentife- 

 rous mixtures. It is commonly superficial, or as a colour- 

 ing principle. 



Some of the veins have yielded fine and rich specimens of 



nickel, 



