248 



BULLETIN" 131, UNITED STATES NATIONAL MUSEUM 



preserved in the National Museum. Ore from the Golconda mine 

 consists of greasy massive white cerusite containing some minute 

 white crystals in cavities. This cerusite is associated with a little 

 minium and bindheimite as an alteration product of coarse galena. 

 Specimens from the Washington mine show massive cerusite associated 

 with coarse galena in a limonite-stained rock and a specimen from 

 the Rocksyfellow mine shows earthy cerusite with anglesite and bind- 

 heimite coating coarse cleavable galena. (Cat. No. 14882, U.S.N.M.) 



Figs. 56-57.-56, Prismatic crystal. Pittsburg-Idaho mine, Lemhi County. 57, Similar crystals 



TWINNED ON r(130) 



SHOSHONE COUNTY 



In Shoshone County cerusite has been the most abundant and 

 characteristic mineral of the oxidized ores, Great bodies of carbonate 

 ore have been mined from the Morning, You Like, Mammoth, Stan- 

 dard, Tiger, Poorman, Hercules, Bunker Hill, Last Chance, Sullivan, 

 Stemwinder, Tyler, Caledonia, Sierra Nevada, and other mines. 



