THE MINEBALS OF IDAHO 77 



of cinnabar and realgar. This is further shown by its oxidation near 

 the surface, which gives rise to considerable amounts of scorodite. 33a 



STIBNITE (28) 

 ANTIMONY GLANCE 



Antimony sulphide, Sb 2 S 3 . Orthorhombic. 



This mineral is the principal ore of the metal antimony. A num- 

 ber of deposits are known in Idaho and although under normal con- 

 ditions these can not be worked in competition with imported metal, 

 considerable amounts of antimony have at times past been produced 

 from them. Well crystallized stibnite specimens have not been 

 seen, although large masses of pure stibnite make good cabinet ma- 

 terial. The principal occurrences are as follows: 



BLAINE COUNTY 



Stibnite is reported to occur in considerable quantities in the 

 Sawtooth Range, but no adequate description of the deposits is 

 available. The so-called antimony or stibnite of the Minnie Moore, 

 Independence, North Star, and other lead mines of the Hailey 

 Quadrangle, Wood River (Mineral Hill) district has all been found 

 upon examination to be boulangerite. 



BOISE COUNTY 



In rich ores of the Boise Basin region at the Mountain Chief, 

 Belshazzar, Gold Hill, and other mines, stibnite has long been re- 

 ported to occur as an associate of gold. This supposed stibnite has 

 proven, upon examination, to be either bismuth sulphide or a bismuth- 

 lead sulphide. 



BONNER COUNTY 



Stibnite occurs in massive form intergrown with other sulphides in 

 silver ore in the Weber mine south of Lake Pend d'Oreille sometimes 

 in fair amount and it also occurs as the ore of an antimony prospect 

 near Smith's ranch on Chloride Creek 4 miles south of the town of 

 Lakeview. 34 



CUSTER COUNTY 



Antimony glance has been reported from Custer County, but 

 nothing could be learned regarding the deposits. 



IDAHO COUNTY 



In Deadwood Gulch just off the road between Oro Grande and 

 Elk City, stibnite occurs as a replacement in granite adjacent to a 

 quartz vein. 35 



«<■ E. S. Larsen. Univ. of Idaho Sch. of Mines Bull. 2, pp. 65-67, 1920. 

 8< Edward Sampson. U. S. Qeol. Survey. Oral communication . 

 »« D. C. Livingston. U. of Idaho Sch. of Mines Bull. 2, 1919. 



