THE MINERALS OF IDAHO 



443 



identified as barite by its optical properties and blowpipe reactions. 

 It is associated with sulphides, including pyrite, sphalerite, tetra- 

 hedrite, and galena. 



CASSIA COUNTY 



Barite occurs with scorodite and cinnabar as the principal gangue 

 mineral in cinnabar prospects in the Black Pine district in Cassia 

 County. The barite forms porous aggregates of tabular white 

 crystals of very simple habit bounded only by the base and unit 

 prism, as shown in Figure 144. Some of the rough crystals which 

 are buff-stained reach 3 cm. in diameter. 46 



CUSTER COUNTY 



Barite has been reported to occur as a gangue mineral in small 

 amount in the Lost Packer mine in the Loon Creek district. Minute 

 white crystals of barite rest on pyrite lining cavities in an aggregate 

 of pyrite and bismuthinite from the Empire ledge in Washington 

 Basin. 



Figs. 144-145.— 144, Barite, Black Pine quicksilver mine, Cassia County. 145, Barite, Del- 

 amar mine, owyhee county 



FREMONT COUNTY 



Barite occurs as bunches scattered through the brown jaspery 

 material of the ore of the Weimer copper mine in the Skull Canyon 

 district. 47 A specimen from this mine contains platy white barite 

 inclosing chalcopyrite. 



LEMHI COUNTY 



Barite is intergrown with quartz in one of the gold veins at Mineral 

 Hill and occurs also as a gangue mineral in two deposits of lead- 

 silver ore at Spring Mountain. It is nowhere abundant. 48 



< 6 E. S. Larsen. Univ. of Idaho Sen. of Mines, Bull. 2, pp. 65-07, 1920. 

 « J. B. Umpleby. U. S. Qeol. Survey, Prof. Paper 97, p. 112, 1917. 

 « J. B. Umpleby. U. S. Oeol. Survey, Bull. 528, p. 75, 1913. 



