28 COLORADO FERBERITE AND THE WOLFRAMITE SERIES. 



Analyses of minerals of 



39. Wolframite from Two Strike mine, Yellow Creek, Lead, S. Dak. W. F. Hille- 

 brand, analyst. Irving, J. D., Economic resources of the northern Black Hills: U. S. 

 Geol. Survey Prof. Paper 26, p. 167, 1904. Besides the items noted, the analysis 

 showed: Fe 2 3 , 3.85; A1 2 O 3 , 0.52; SrO, 0.02; BaO, 0.04; K 2 O+Na 2 0+Ll 2 0, 0.08; 

 H 2 0, below 105 C., 0.20; H 2 above 105 C., 0.87; As 2 6 , 1.25; P 2 5 , 0.12; traces of 

 V 2 5 and S or S0 3 . Extremely minute traces of Zn, Cu, Sb, and Sn were also found. 

 Assays gave: Gold 0.05 ounce and silver 0.25 ounce to the ton of 2,000 pounds. The 

 P 2 5 was probably combined with CaO as apatite, and 0.18 has therefore been deducted 

 from the CaO before combining it with W0 3 for scheelite. The FeO is not sufficient, 

 as indicated by the analysis, to combine with the W0 3 , and 0.6 must be taken from the 

 Fe 2 3 to supply the deficiency. A partial analysis of a specimen from the Harrison 

 mine, near Lead, is given, as follows: SiO 2 , 9.60; W0 3 , 61.70; Fe 2 3 and FeO, 12.67, 

 MnO, 7.21; CaO, 5.39. Recalculated: W0 3 , 76.5; FeO, 9.5; MnO, 14.0; FeW0 4 ; 

 40.2; MnW0 4 , 59.8; CaW0 4 , 39.4. In this analysis the CaO (5.39) is high, and no de- 

 termination of P 2 5 is indicated. There is no corresponding increase in the W0 3 and 

 the relation of the FeO: MnO is so much different as to indicate that part of the lime 

 probably belongs in apatite. Specimens of ore collected by the present writer from 

 this general locality and examined microscopically show apatite in small quantity. 

 As given, the analysis falls between Nos. 31 and 32. 



40. Wolframite from Montebelleux, Brittany, France. Bourion, F., Sur un mode 

 general de preparation des chlorures anhydres et ses applications a 1'analyse chimique: 

 Annales chim. phys., 8th ser., vol. 21, p. 103, 1910. 



41. Wolframite from the Kupfergrube, Sadisdorf, Germany. Winter, H., Ueber 

 Vorkommen und Reindarstellung des Scandiums: Inaugural-Dissertation, Friedrich- 

 Wilhelms-Universitat zu Berlin, p. 23, 1911. Besides the items mentioned, the analy- 

 sis shows P0 4 , 2.23; Mo0 3 , trace; earth acids (Ta0 2 , Ti0 2 ), 2.07; PbO, 0.46; Sc, 0.2. 

 It is stated that calcium phosphate was present in the gangue, and the CaO has there- 

 fore been combined with the P0 4 , which it is hardly sufficient to satisfy. 



42. Wolframite from the Kupfergrube, Sadisdorf, Germany. Winter, H., Ueber 

 Vorkommen und Reindarstellung des Scandiums: Inaugural-Dissertation, Friedrich- 

 Wilhelms-Universitat zu Berlin, p. 22, 1911. The analysis also showed: TiO 2 and 

 Ta0 2 , 0.63; PbO and Sn0 2 , 0.47; Sc, 0.2. 



43. Wolframite from the Tavoy district, Lower Burma. Analysis by C. S. Fawcitt. 

 Bleeck, A. W. G., On some occurrences of wolframite lodes and deposits in the Tavoy 

 District of Lower Burma. India Geol. Survey Records, vol. 43, pt. 1, pp. 67-68, 1913. 



