216 BULLETIN 131, UNITED STATES NATIONAL MUSEUM 



BOISE COUNTY 



In Boise County calcite has been noted at a number of places. As 

 a gangue mineral it has been noted in several mines of the Willow 

 Creek district and it is abundant in the ore of the Friday mine. 24 

 The gangue in the Black Crook vein in the same district is quartz 

 and pink calcite colored by manganese. 25 



In the Overlook mine, Pioneerville district, calcite forms well- 

 developed transparent colorless crystals up to 1 cm. in length in a 



41 43 



Figs. 41-43. — 41, Calcite. Crystals associated with hematite and garnet, Bannock County. 



42, Calcite. Overlook mine, Pioneerville district, Boise County. 43, Calcite. Associated 



with zeolites in basalt. Olenns Ferry, Elmore County 



gold ore associated with quartz containing galena and pyrite. The 

 forms present on the crystals, which are of the habit shown in Figure 

 42, are as follows (Dana notation) : m(10T0),a(1120),v(2131),r(10Tl), 

 y(3251), and z(1341). 2n 



CUSTER COUNTY 



In the Alder Creek district calcite occurs in both oxidized and 

 primary ore of the contact-metamorphic copper deposits. In the 

 primary ore it occurs both as veinlets and in vugs. It has not been 



" Waldemar Lindgran. U. S. Gool. Survey, ISth Ana. Rept., pt. 3, p. 716, 1898. 



« Idem., p. 717. 



38 Earl V. Shimon. Pro;;. U. S. Nat. Mm., vol. 53, pp. 412-113, 1920. 



