THE MINERALS OF IDAHO 



219 



quartz and adularia (valencianite) in cavities in massive epidote in 

 a specimen from the Silver City district. 



SHOSHONE COUNTY 



Massive or granular calcite has been noted in a number of veins in 

 the Coeur d' Alene district and a few specimens of well crystallized 

 material have been found from time to time. As a gangue mineral 

 granular calcite has been noted in the silver vein of the Yankee Boy 

 mine on Big Creek and in the vein worked by the old workings of 

 the Hypotheek mine near Kingston, where it is the gangue of p3'rite 

 and tetrahedrite. 



Small open cavities in the ore of several of the larger mines have 

 produced well-crystallized specimens of calcite, the form in each of 

 the several occurrences observed being like shown in Figure 47, the 

 flat rhombohedron e(01i2) (Dana notation) being the dominant 

 form. These crystals often tend to aggregate in piles of individuals 

 in approximately parallel position. Specimens showing piles of 



Figs. 4&-47.— 46, Calcite. Silver City district, Owyhee County. 47, Calcite. 



Shoshone County 



HECLA MINE' 



crystals up to 1 cm. in diameter, white and translucent, were obtained 

 on the No. 13 level of the Bunker Hill mine. These occurred lining 

 a crack and overlying masses of sphalerite. They were found by 

 R. O. Jones in 1912 and all the specimens preserved were deposited 

 in the Industrial Union cabinet in Kellogg. Crystals of similar 

 habit and size but of a yellowish color were collected by Dr. F. L. 

 Ransome in the Hecla mine in 1904. Measurements made on a 

 crystal from the latter specimen furnished data for the drawing 

 figure 47. An open crack in one wall of the vein on the 2,000 foot 

 level of the Standard-Mammoth mine, in 1915, was lined with groups 

 of translucent colorless crystals of this habit aggregated into large 

 groups, the individual crystals of which are 2 cm. across. An open 

 crack on the 800 foot level of the Hercules mine was also lined by 

 crystals up to 1 cm. across of the same habit, which were translucent 

 and greenish in the interior and were opaque and brownish in the 

 outer layer. These were partly coated with crystalline aggregates 

 of pyrolusite. 



