218 



BULLETIN 131, UNITED STATES NATIONAL MUSEUM 



White granular calcite, with quartz, forms the gangue of auriferous 

 pyrite in gold ore from the A. D. & R. mine in the Gibbonsville dis- 

 trict. A specimen from the Parker Mountain mine, Parker Mountain 

 district, contains small crystals of calcite associated with aragonite 



•15 



Figs. 44-45. — 44, Calcite. Pittsburg-Idaho mink, Lemhi County. 45, Calcite. From cavities in 

 psilomelane. parker mountain mine, lemhi county 



in cavities in psilomalane. These, as illustrated in Figure 45, are 

 unusual in habit showing the forms v (5.5.10.4) dominant with smaller 

 faces of 5 (TT22), - T \ (3.3.6.10), +^(1124) and o(0001). These 

 gave the following measurements. 



Measurements of calcite, Figure 45, Lemhi County 



Form 



No. Letter 



new(?)_ 

 ...do... 



a 



Symbol 



Gdt. Miller 





 +M 

 -A 

 -Vi 

 -i 



0001 

 1154 



5.3.6. 10 

 TI22 



5. 5. 10. 4 



Quality, description 



Very good . 

 Very poor. 



do 



Medium... 

 Very poor. 



Measured 



30 00 



30 00 



30 00 



30 00 



00 



14 15 



16 35 



26 09 



50 50 



Calculated 



30 00 



30 00 



30 00 



30 00 



00 



13 51 



16 29 



26 15 



50 67 



OWYHEE COUNTY 



Although most of the calcite of Owyhee County silver veins is 

 of the variety described below as argentine, a few crystals of the 

 "nail head" habit illustrated in Figure 46 were found associated with 



