THE MINERALS OF IDAHO 



255 



specimens. The management has, within recent years, shown a very- 

 gratifying interest in having the specimens preserved and has sent 

 a number of lots to the National Museum, so that more crystals have 

 been available for study from this mine than from all the rest of 

 the Coeur d' Alene region during the preparation of this bulletin. 

 As a consequence an unusual number of crystals from this mine have 

 been measured and the various habits encountered are illustrated in 

 the drawings, Figures 63 to 69, inclusive. The specimens have come 

 from the oxidized portion of the vein which intersects the quartzite 



64 

 Figs. 63-64.-63, Cerusite. Simple prismatic crystal. Drawn with a axis vertical. Lookout 

 Mountain mine, Pine Creek, Shoshone County. 64, Cerusite. Simple dark-colored crystal 

 drawn with o axis vertical. lookout mountain mine 



of the middle member of the Prichard formation. The minerals as- 

 sociated with the cerusite, including linarite, leadhillite, caledonite, 

 bindheimite, and pyromorphite are described in their appropriate 

 place in this report. The crystals vary from 1 mm. to 5 cm. in 

 greatest diameter. They are for the most part colorless, but vary 

 through amber and various tones of gray to the black material like 

 that mentioned from the Hypotheek mine. The measured crystals 

 may be described individually to show the range in crystal habit 

 shown by the material which is more or less typical for the district. 



