COMPOSITION OF FERBERITE AND OTHER MEMBERS OF SERIES. 25 

 the wolframite series. 



11. Hiibnerite from the Comstock mine, Lawrence County, S. Dak. Headden, 

 W. P., Mineralogical notes: Colorado Sci. Soc. Proc., vol. 8, p. 175, 1906. "A black 

 mineral fairly well crystallized." 



12. Hubnerite from Cement Creek, Silverton, Colo. Genth, F. A., Contributions 

 to mineralogy, No. 52; with crystallographic notes by S. L. Penfield: Am. Jour. Sci., 

 3dser.,vol. 43, p. 186, 1892. 



13. Hubnerite from the Idaho Tungsten Co.'s property in the Blue Wing district, 

 on Patterson Creek, Lemhi County, Idaho. An unpublished analysis by J. E. 

 Talmadge, communicated by J. G. Lind. It seems improbable that from these 

 deposits a specimen could be selected, the analysis of which would show neither Si0 2 

 nor CaO, but this is of course surmise. In the analysis given, were the ordinary error 

 of high MnO made, it might account for the good summation, were other elements 

 undetermined. On the other hand, manganese oxides occur in the vein in some 

 quantity (see Umpleby, J. B., Geology and ore deposits of Lemhi County, Idaho: 

 U. S. Geol. Survey Bull. 528, pp. 3, etc., 1913), and it may well be that they are present 

 in interstices of the hiibnerite, part of which is so dark as to suggest the inclusion of 

 either manganese or iron oxides. 



14. Hubnerite from Sunday Gulch, near Hill City, S. Dak. Headden, W. P., 

 Mineralogical notes: Colorado Sci. Soc. Proc., vol. 8, p. 176, 1906. "Granular, almost 

 entirely free from admixed gangue" (p. 175). 



15. Hubnerite from Dragoon Mountains, Ariz. Guild, F. N., The mineralogy of 

 Arizona, p. 92, 1910. 



16. Hubnerite from Bonito Mountain, near White Oaks, N. Mex. Genth, F. A., 

 Contributions to mineralogy, No. 52; with crystallographic notes by S. L. Penfield: 

 Am. Jour. Sci., 3d ser., vol. 43, p. 187, 1892. 



17. Hubnerite from Oroville, Wash. R. C. Wells, of the U. S. Geol. Survey, 

 analyst. Si0 2 includes any other insolubles. Ta, Cb, Sn, Mo, and rare earths are not 

 present in appreciable quantities. 



18. Average of two analyses of hubnerite from Bayevka, Ural Mountains. Beck, 

 W., and Teich, N., Ueber Wolfram und Scheelit aus Fundorten Russlands: Russ.-k. 

 mineral. Gesell. St. Petersburg Verh., 2d ser., vol. 4, pp. 315-316, 1869. 



