76 MINERALS OF CHILE. 



MIMETENE, CHLORO-ARSIENATE OF LEAD. 



This compound of lead has been found in an impure state at 



Mina Grande, 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 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 (Pb, da) 3 (Is £)+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. 



WULFENITE, MOLYBDENATE OF LEAD. 



It is found 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 Pb Mo. 

 Domeyko gives the analysis of a specimen where lime ap- 

 pears to replace part of the lead. It is as follows : 



Oxide of lead 43.0 



Molybdicacid 42.2 



Lime 6.3 



Peroxide of iron 8.5 



100.0 

 METEORIC IRON. 



This is found scattered in some parts of the desert of Ata- 

 cama, in pieces from the size of a small nut to lumps weighing 

 fifty pounds and more. It is of a porous nature, the pores 



