188 BULLETIN 131, UNITED STATES NATIONAL MUSEUM 



LEMHI COUNTY 



Molybdite occurs sparingly as an alteration product of molyb- 

 denite near the surface in the hubnerite-bearing tungsten vein of the 

 Ima Mine, Blue Wing district. 



TUNGSTITE (220) 



Tungsten trioxide, W0 3 .H 2 0. Orthorhombie. 



Tungstite is a mineral commonly formed in small amounts in the 

 oxidation of other tungsten minerals. It is commonly bright yellow 

 in color and earthy in appearance and is known by the common name 

 of tungstic ocher. 



LEMHI COUNTY 



Tungstite occurs in small amount in the tungsten ores of the Blue 

 Wing district as waxy to ocherous fillings in small cavities in rusty 

 quartz which contains hubnerite. This material is found, upon 

 microscopic examination, to be very finely crystalline with an index 

 of refraction much above 1.84, which proves that it is tungstite 

 rather than ferritungstite, which, while similar in appearance has an 

 index of refraction of 1.80 and below. 



CERVANTITE 



Antimony oxide, Sb 2 03.Sb 2 05. Orthorhombie. 



Cervantite or antimony ocher is the name usually applied to yellow 

 pulverulent materials occurring as oxidation products of stibnite. 

 Such bright yellow ocherous materials have been called cervantite, 

 although no definite confirmation of the identification has been 

 obtained. The status of cervantite as a species is somewhat in doubt. 



BLAINE COUNTY 



Cervantite is reported to have been mined on Wood River. 90 



SHOSHONE COUNTY 



Both at the Stanley mine in George Gulch above Burke and at the 

 Coeur d'Alene antimony mine of Pine Creek and probably at other 

 antimony mines in the county, the stibnite of the ore is often slightly 

 altered with the formation of thin coatings of a bright yellow ocherous 

 material which has been called antimony ocher or cervantite. This is 

 always in very thin crusts, apparently passing over into the dirty 

 whitish hydrated oxides mentioned under stibiconite. 91 



»o E. S. Dana. System of Mineralogy, sixth edition, p. 1092, 1895. 

 81 Earl V. Shannon. Amer. Mineralogist, vol. 3, p. 24, 1918. 



