THE MINERALS OF IDAHO 



257 



illustrated in normal position in Figure 65. These are of small size 

 and appear both as simple crystals and as contact and penetration 



Figs. 65-66.— 65, Cerusite. Stout, colorless crystal. Lookout Mountain mine. 66, Cerusite. 

 Crystal moderately elongated on a axis showing ordinary forms. Lookout Mountain 



twins on ra(110). The measurements obtained on the one illustrated 

 in the drawing are given in the next table. 



Measurements of cerusite, Lookout mine, Figure 65, normal posiiton 



54347—201 18 



