46 BULLETIN 131, UNITED STATES NATIONAL MUSEUM 



TITANIUM 



Rutile, titanium dioxide. 



Ilmenite, iron-titanium oxide. 



Titanite, calcium-titanium silicate. 



Brannerite, uranium titanate. 



Also the rare earth minerals, polycrase, euxenite, samarskite, etc. 



TUNGSTEN 



Wolframite, iron-manganese tungstate. 

 Ferberite, iron tungstate. 

 Hubnerite, manganese tungstate. 

 Scheelite, calcium tungstate. 

 Tungstite, tungsten oxide. 



URANIUM 



Samarskite. 

 Brannerite. 

 Polycrase, etc. 



ZINC 



Sphalerite, zinc sulphide. 

 Wurtzite, zinc sulphide. 

 Smithsonite, zinc carbonate. 

 Aurichalcite, zinc-copper carbonate. 

 Calamine, zinc silicate. 



ZIRCONIUM 



Zircon, zirconium silicate. 



DESCRIPTIONS OF MINERALS 



DIAMOND (1) 

 Carbon, C. Isometric. 



ADAMS COUNTY 



Diamonds have been authentically reported to occur in Idaho only 

 in the Rock Flat gold mine in Adams County at the head of Little 

 Goose Creek Canyon, 5 miles east of New Meadows. Here three 

 small crystals were found in heavy concentrates from a testing opera- 

 tion on several cubic meters of the gravel. The largest of the dia- 

 monds was an almost perfect octahedron weighing one-third of a 

 carat and having a grayish color and typically greasy luster. The 

 angles were somewhat rounded with a fused appearance. The heavy 

 residue of concentrate from each cubic yard of gravel weighed 90 

 pounds and, in addition of 15 cents worth of coarse gold, contained 

 3 per cent of ilmenite, magnetite, and a little chromite, and 20 per 

 cent of zircon sand, and the balance being made up of corundum, 

 garnet, and monazite. Variously colored corundum crystals are 

 common here. 3 



OWYHEE COUNTY 



A brief reference in an old Government publication states that 

 diamonds have been reported to exist on Owyhee River 3a ; a few small 

 stones have been reported and probably some were found in the placer 



> Robert N. Bell, 15th Ann. Rept. Idaho State Mine Inspector, pp. 218-219, 1913. 



3* Wm. P. Blake, Annotated catalogue of the principal mineral species hitherto recognized in California 

 and the adjoining States and Territories. Browne and Taylor, Min. Resources U. S., 1866, p. 201. 



