NO. 1882 PYRITS CARRYING GOLD AND GALENA — POGUE) 483 



gold and galena is surrounded by low ramparts of pyrite; the gold 

 is never more than half buried ; so far as the interior of the 

 crystal can be examined by means of the two pits, none of the 

 three associated minerals can be discovered within the pyrite. The 

 most probable paragenesis is therefore regarded as this : The pyrite. 

 when its present size was nearly attained, sustained a deposition of 

 crystallized gold upon its surface followed by the precipitation of a 

 small amount of chalcopyrite which, in turn, was succeeded by the 

 formation of the galena. A further slight accretion of pyrite com- 

 pleted the development of the specimen. 



