THE MINERALS OF IDAHO 245 



Measurements of cerusite, Figure 55, Red Bird mine, normal position 



Form 



Symbol 



No.. Letter Gdt. I Miller 



16. 



2 : a. 



3 m 



4 j r. 



5 x. 



6 k 



7 i. 



8 V 



9 IT 



10 | p 



11 I o. 



12 ' 5. 



0» 

 ooO 



CO 



oo3 



01 



02 

 '-,0 

 VsO 



1 

 H 



12 



010 

 100 

 110 

 130 

 012 

 Oil 

 021 

 102 

 302 

 111 

 112 

 121 



Quality, description 



Excellent 



Good 



Excellent 



do 



Good 



Fair 



Verv good 



Good 



Very poor, minute 



Verv good 



Good 



Very poor 



Measured 



00 



90 03 



58 42 



28 40 



00 



00 



00 



90 05 



90 05 



58 39 



58 39 



39 12 



90 00 



90 00 



90 00 



90 00 



19 32 



35 36 



54 41 



30 39 



61 31 



54 13 



34 42 



61 54 



Calculated 



00 



90 00 



58 37 



28 39 



00 



00 



00 



90 00 



90 00 



58 37 



58 37 



39 20 



90 00 



90 00 



90 00 



90 00 



19 52 



35 52 



55 20 



30 39 



60 38 

 54 14 

 34 46 



61 51 



Although the Ramshorn mine lias not mined much carbonate ore, 

 some cerusite occurs in vugs. A specimen from this mine in the 

 Museum (Cat. No. 56520, U.S.N. M.) contains colorless and white 

 crystals of cerusite associated with mimetite and bayldonite in a 

 vug in galena-tetrahedrite ore. The cerusite crystals vary from 

 short prismatic parallel to the a axis to relatively thin tabular paral- 

 lel to 6(010). Some of the prismatic crystals are distorted by 

 unequal development of corresponding faces of the brachydomes. 

 One such, which was measured, gave the following angles: 



Measurements of cerusite, prismatic type, Ranishorn mine, Custer County, normal 



position 



