384 BULLETIN 131, UNITED STATES NATIONAL MUSEUM 



is slickensided and is leek-green in color with a splintery-fibrous 

 structure. It may be classified as the variety known as picrolite. 



FREMONT COUNTY 



Asbestiform serpentine has been reported to occur north of Ash ton. 93 



GARNIERITE (483a) 



Variable hydrous silicate of magnesium 



and nickel approximating the formula Amorphous. 



(Ni,Mg)O.Si0 2 .H 2 0.?iH 2 0. 



Garnierite is an indefinite mineral, usually earthy to waxy in appear- 

 ance with a green color. Where abundant it is mined as a source of 

 nickel as in New Caledonia. Only one report of its occurrence in 

 Idaho has been received. 



CUSTER COUNTY 



A vein of garnierite of considerable size has been reported to have 

 been found near Clayton in Custer County. 94 Nothing further has 

 been learned about this report. No specimens have been examined. 



TALC (484) 



Hydrous magnesium silicate, 3MgO. Monoclinio. 



4Si0 2 .H 2 0. 



Talc occurs as a micaceous foliated and very soft mineral with 

 smooth feel and also in less pure form making up beds or masses of 

 rock known as steatite or soapstone. No attention has been paid 

 to its occurrences in Idaho and practically none of importance are 

 known. The clayey materials occurring as gouges along faults and 

 fissures in metal mines in Idaho which the miners call "talc" are not 

 talc but are usually sericite, leverrierite, kaolin or some other clayey 

 mineral. 



ADAMS COUNTY 



Talc is listed by Livingston and Laney as a mineral of the contact- 

 metamorphic deposits of the Seven Devils. 



SHOSHONE COUNTY 



A few specimens of talc have been seen in a lot of metamorphic 

 minerals from somewhere in the St. Joe region. 



CELADONITE (489) 



Silicate of iron, magnesium and potas- Earthy, soft, minute-scaly, 



sium, Formula doubtful. 



OWYHEE COUNTY 



The rhyolite adjacent to the silver-gold veins of the De Lamar 

 and other mines of the De Lamar district, which has been profoundly 



" Robert N. Bell. 19th Ann. Rept. on Mining Industry of Idaho for 1917, p. 99, 1918. 

 »' Robert N. Bell. Personal letter, 1919. 



