474 BULLETIN 131, UNITED STATES NATIONAL MUSEUM 



CUSTER COUNTY 



Powellite occurs as an alteration product of molybdenite in sev- 

 eral specimens labeled as from the Bay Horse district in Custer 

 County. The powellite forms dirty white pearly plates up to 1 cm. 

 broad interleaved with molybdenite. A little molybdite is asso- 

 ciated with the powellite. 



STOLZITE (817) 

 Lead tungstate, PbO.W0 3 Tetragonal. 



Only one report of the existence of stolzite in Idaho has been 

 received. 



SHOSHONE COUNTY 



Stolzite is reported to have been found with other oxidized lead 

 minerals in the Hypotheek mine near Kingston in 1916. 00 No speci- 

 mens of the mineral nor any detailed notes on its occurrence have 



been available. 



WULFENITE (818) 



Lead molybdate, PbO.Mo0 3 . Tetragonal 



Although nowhere abundant or in exceptionally large and fine 

 crystals, the orange yellow lead molybdate has been examined or 

 reported from the following localities: 



BEAR LAKE COUNTY 



Wulfenite occurs in the Blackstone claim, St. Charles district, in 

 the Bear River Range, on the north side of St. Charles Creek, Z x /l 

 miles west of the town of St. Charles. The mineral is in wax-yellow 

 tabular crystals associated with cerusite. 91 



BLAINE COUNTY 



A number of specimens collected by D. F. Hewett, of the United 

 States Geological Survey, from the Golden Bell mine near the head 

 of the ravine which contains the Minnie Moore mine, near Bellevue, 

 contain small orange-yellow crystals of wulfenite abundantly dis- 

 tributed in siliceous skeletal masses. The crystals vary considerably 

 in development. Many of them are square tablets, showing only a 

 single prism and basal pinacoid (fig. 165). Many are tabular com- 

 binations of the base c(001) and the pyramid p(lll) with the corners 

 truncated by e(011), while in others the dominating form bounding 

 the tables is e(011) and p(lll) forms only small corner faces. In a 

 few of the latter ra(110) is present as narrow faces. Some of the 

 crystals appear hemimorphic with the pyramidal faces above and 

 only the basal pinacoid below. The angles measured are as follows : 



90 Ernest Leroy Adkins. Personal letter, 1917. 



" R. W. Richards. U. S. Geol. Survey, Bull. 170, p. 182, 1911. 



