THE MINERALS OF IDAHO 

 SHOSHONE COUNTY 



451 



A specimen from the Caledonia mine has previously been de- 

 scribed 53 as consisting chiefly of massive cerusite bearing on its 

 surface ocherous limonite, drusy crusts of linarite, stains, and crusts 

 of caledonite ( ?) and irregular masses of a greenish to brownish-white 

 mineral. The latter mineral is altered and etched on the outside 

 and resembles cerusite except that where broken open the masses 



155 156 



Figs. 155-15G — Anglesite. Uypotheek mine, Shoshone County 



show very perfect cleavage in one direction with pearly luster on 

 the cleavage face. Before the blowpipe on charcoal with sodium 

 carbonate the mineral gives a lead oxide coating and a button of 

 metallic lead. It is soluble in hot hydrochloric acid with evolution 

 of carbon dioxide and the solution reacts for sulphuric acid with 

 barium chloride. The perfect basal cleavage makes it an easy 



« Earl V. Shannon. Linarite and Lcadhillite from Idaho. American Mineralogist, vol. 4, p. 94, 1919. 



