THE MINERALS OF IDAHO 

 Measurements of wulfenite from Blaine County 



475 



FREMONT COUNTY 



In the Old Scott mine of the Birch Creek Mining Co., in the Birch 

 Creek district, the principal minerals of the ore are cerusite, angle- 

 site, and galena. Above the 100-foot level carbonates predominate 



165 166 



Figs. 165-166.— 165, Wulfenite. Golden Bell mine, Blaine County. 166, Wulfenite. 

 Scott mine, Fremont County 



Old 



and here wulfenite, though comparatively rare, is conspicuous be- 

 cause of its orange color. 92 A number of specimens have been exam- 

 ined from this mine and some crystals have been measured. These 

 are all tabular plates but they vary somewhat in habit. Small 

 orange crystals in manganese-stained sand carbonate ore are tabular 

 and bounded by 6(113) and narrow faces of p(lll) with the corners 

 bearing narrow line faces of r (013) (fig. 166). Specimens from the 

 150-foot level north of the shaft contain small orange-wulfenite crys- 

 tals with cerusite on calcite and steel galena. These crystals, which 

 are thick tabular, are bounded by well-developed faces of o(012) 



•2 J. B. Umpleby. U. S. Oeol. Survey, Prof. Paper 97, p. 119, 1917. 



