GUIDE TO THE MIXERALOGIC COLLECTIONS 



59 



Pyrite deposits are worked for the production of sulfuric acid 

 in Louisa county, Va., in the Rio Tinto region of Spain and in 

 various other localities including one at Hermon, St Lawrence 



Fig. 170 Fig. 171 Fig. 172 



Pyrite 



co. N. Y. Sometimes gold and copper contained in small quan- 

 tities in pyrite are recovered. 



Smaltite, chloanthite (CoNi)As 2 



The minerals of this group pass from one to the other by such 

 insensible gradations that it is often impossible to separate 

 them. Smaltite is essentially cobalt diarsenid containing 71.8$ 

 arsenic and 28.2$ cobalt. Chloanthite is essentially nickel 

 diarsenid and contains 71.9$ arsenic and 28.1$ nickel. 



The crystals are similar to those of pyrite. The mineral 

 usually occurs in tin-white to steel-gray metallic masses. 



It occurs in veins with other ores of cobalt, nickel, copper 

 and silver, notably in the Saxon and Bohemian localities. It 

 is also found at Chatham Ct, Franklin N. J. and in California. 



It is the main source of the cobalt products. 



Cobaltite (cobalt glance) CoAsS 



Cobaltite, the sulfarsenid of cobalt, contains 19.3$ sulfur, 13.2 r c 

 arsenic and 35.5$ cobalt. 



