THE MINERALS OF IDAHO 



87 



and impregnated with cerargyrite in the more open cellular portions. 

 In the ore from the Pauper mine it also forms rich streaks of scat- 

 tered microscopic grains in coarse comb quartz in granite. In the 

 Henrietta mine argentite occurs also in small grains disseminated in 

 quartz which bears crusts of miargyrite crystals. (Cat. No. 14809, 

 U.S.N. M.) A specimen from the Trade Dollar mine, 1,300 foot 

 level contains a heavy mass of sectile argentite 5 cm. square and 

 averaging 1 cm. thick, in quartz. Near the borders of the mass the 

 argentite contains intergrown chalcopyrite. Specimens of ore from 

 a raise 1,300 feet from the portal of the Blaine tunnel, Silver City 

 district show argentite as finely disseminated grains with chalcopy- 



4 5 



Figs. 4-5. — Argentite. Distorted crystals. Coeur d'Alene district 



rite in a quartz-adularia aggregate and as dull crystals of small size 

 resting upon druses of quartz crystals in cavities. In the Flint dis- 

 trict argentite occurs in several mines. In the Rising Star mine it 

 forms scattered fairly large grains in quartz with polybasite, grains 

 of stephanite, pyrargyrite, stromeyerite, and xanthoconite and blades 

 of stibnite. 



SHOSHONE COUNTY 



In Shoshone County argentite has been reported to occur dis- 

 seminated in quartz in silver ore from the Big Creek mine on Big 

 Creek, and it probably occurs mixed with sooty covellite in rich 

 silver ores from the Caledonia mine. 



A group of specimens in the Museum collections (Cat. No. 85032, 

 U.S.N.M.) received from the United States Geological Survey 



