THE MINERALS OF IDAHO 43 



BERYLLIUM 



Smaltite, cobalt arsenide. 

 Proustite, silver arsenic sulphide. 

 Enargite, copper-arsenic sulphide. 

 Tennantite, copper-arsenic sulphide. 

 Erythrite, cobalt-arsenic oxide. 

 Scorodite, iron-arsenic oxide. 

 Annabergite, nickel-arsenic oxide. 

 Mimetite, lead-arsenic oxide. 



Barite, barium sulphate. 



Ber}d, beryllium-aluminium silicate. 



Bismuth. 



Bismuthinite, bismuth sulphide. 

 Galenobismutite, bismuth-lead sulphide. 

 Aikinite, bismuth-lead-copper sulphide. 

 Tetradymite, bismuth telluride. 

 Guanajuatite, bismuth selenide. 

 Bismutosphaerite, bismuth carbonate. 

 Bismutite, bismuth carbonate. 



BORON 



Tourmaline, iron-aluminium-boron, etc., silicate. 

 Ludwigite, magnesia-iron borate. 



CADMIUM 



Greenockite, cadmium sulphide. 



CERIUM 



Monazite, cerium phosphate. 



Also samarskite, gadolinite, aeschynite, polycrase, etc. 



CHROMIUM 



Chromite, chromium-iron oxide. 



COBALT 



Cobaltite, cobalt-arsenic sulphide. 



Smaltite, cobalt arsenide. 



Danaite, iron cobalt-arsenic sulphide. 



Gersdorffite, iron-nickel-cobalt-arsenic sulphide. 



Erythrite, cobalt-arsenic-oxide. 



Asbolite, cobalt-manganese oxide. 



COPPER 



Native copper. 

 Chalcocite, copper sulphide. 

 Covellite, copper sulphide. 

 Stromeyerite, copper-silver sulphide. 

 Bornite, copper-iron sulphide. 

 Chalcopyrite, copper-iron sulphide. 

 Tetrahedrite, copper-antimony sulphide. 

 Tennantite, copper-arsenic sulphide. 

 Enargite, copper-arsenic sulphide. 

 Cuprite, copper oxide. 

 Melaconite, copper oxide. 

 Malachite, copper carbonate. 



