THE MINERALS OF CHILE. 99 



sulphuret of tlie San Antonio mine there is arseniuret and native silver. Taking the chloride 

 and chloro-bromide as a distinguishing mark between the mines, they may be divided into two 

 classes ; those like Chaiiarcillo and Agua Amarga abounding in these two minerals, and those 

 like San Antonio, San Lorenzo, San Pedro Nolasco, &c., the prominent minerals of which are 

 the sulphuret and arseniuret of silver, with barely traces of the chloride. 



MERCURY. 



Cinnabar. — This mineral of mercury occurs in no great masses in Chile. It is usually found 

 in the granite formation near veins of gold and copper, as in Coquimbo and Aconcagua ; also 

 in a vein of quartz, in some stratified porphyry, near the gold mines of Andacollo. The 

 gangue accompanying cinnabar is quartz, with micaceous and hydrated oxide of iron. The 

 composition of the cinnabar is — 



Mercury ---_-__ 86.2 

 Sulphur ---_._- 13.8 



100.0 



The formula is Hg S. 



LEAD. 



Galena. — It is found in some parts of Chile, commonly associated with the sulphurets of 



other metals. Composition — ■ 



Lead -------- 86.66 



Sulphur ------- 13.34 



Formula, Pb S. 

 Mimetene, Cliloro-Arsejiate of Lead. — This compound of lead has been found, in an impure 



state, at Mina G-rande, east of Arqueros, mixed with the vanadates of lead and copper. The 



analysis of a specimen by Domeyko gives — 



Chloride of lead - - - - - - 9.05 



Oxide of lead ------ 58.31 



Oxide of copper --■=■--- 0.92 



Arsenic acid - - - - - - 11.55 



Phosphoric acid - - - - - - 5.13 



Vanadic acid - - - - - - 1.86 



Lime ------- 7.96 



Alumina and peroxide of iron - - - 1.10 



Clay -------- 2.00 



Ignition - - - - - - - 1.12 



99.00 



Mimetene, when pure, has for its formula — 



3 {th, Ca) 3 (Xs P) + Pb CI. 

 Vanadinite. — This is found at the same locality as the last mineral, and mixed with it and 

 vanadate of copper and lead. It has not been discovered crystallized, nor has it been separated 

 in a state of purity from the accompanying minerals. 



Widfenite, Molyhdenate of Lead. — It is fotmd in the province of Coquimbo, in orange colored 

 octahedral crystals ; also, in lemon-yellow plates, with the usual composition — 

 Oxide of lead - - - - - - 60.81 



Molybdicacid ------ 39.19 



Having for its formula tb Mo. 



