THE MINERALS OF IDAHO 



339 



£(010) face. The habit is illustrated in Figure 106. One which was 

 measured gave the following angles : 



Calamine crystal, Red Bird mine, Figure 106 



Form 



No. 



Letter 



Symbol 



b 

 rr 

 s 

 i? 

 t. 



Qdt. 





 Ooo 



CO 



10 



HO 



30 

 01 



Miller 



001 

 010 

 110 

 101 

 102 

 301 

 011 



Quality, description 



Very poor, minute. 



Good 



do. 



Very good 



Very poor. 



Good 



do 



Measured 



Calculated 



22 



51 34 



89 47 



90 00 

 90 03 



10 



00 



90 00 



90 00 



30 59 



10 34 



61 26 



25 28 



00 



51 55 



90 00 



90 00 



90 00 



00 



00 



90 00 



90 00 



31 22 



16 57 



61 20 



25 32 



Specimens from the Pacific mine contain sheaves of white calamine 

 crystals in cavities of galena-quartzite ore and also colorless crystals 

 of calamine on drusy quartz associated with cerusite in oxidized ore. 

 The crystals are similar to those last described from the Red Bird 

 mine, except that the clinodome <>(01 1) is not so prominent. The habit 

 of crystals from this mine is shown in Figure 105. These gave the 

 following measurments : 



Measurements of calamine crystals, Pacific mine, Figure 105 



Specimens from the Beardsley mine show similar minute crystals 

 forming druses with malachite and calcite on a siliceous matrix, and 

 on chrysocolla. The latter crystals have the very simple habit shown 

 in Figure 107, the only forms present being &(010), m(110), and 

 <*(011). 



LEMHI COUNTY 



Calamine occurs in Lemhi County, particularly in the Pittsburg- 

 Idaho and other mines of the Texas district in oxidized lead-silver 

 ores in the usual beautiful needle crystals, usually sot on a drusy base 

 of smithsonite, as in the specimen illustrated by Umpleby. 64 A speci- 

 men labeled as from the 400 foot level, Flat vein, Pittsburg-Idaho 

 mine consists of manganese-stained clayey material containing 

 cavities lined with long slender deeply striated calamine crystals 



m J. B. Umpleby. U. S. Geol. Survey, Bull. 528, pp. 75, 103, pi. 10, 1913. 



