COMPOSITION OF FEBBERITE AND OTHER MEMBKKS Of I l;IKS. 35 

 tin- nolframite series Continued. 



91. Ferberite from the Barker ranch, Nederland, Boulder County, Colo. Analysis 

 by J. B. Ekeley. George, R. D., The main tungsten area of Boulder County, Colo.: 

 Colorado Geol. Survey First Kept., p. 42, 1909. 



92. Ferberite from Winnebago mine, Gilpin County, Colo. Analysis furnished by 

 E. M. Green, Rollinsville, Colo. The original gives: FeO, 22.11, and Fe 2 O 3 , 3.01. 

 The ferric oxide has been calculated to its equivalent of ferrous oxide, and this seems 

 to accord better with the remainder of the analysis. 



93. Analysis of a pseudomorph of ferberite (reinite) after scheelite from Otomezaka 

 or Kurasawa, Japan, by F. Kodera. Quoted by Tsunashiro Wada, Minerals of Japan 

 (translated by Takudzi Ogawa), p. 77, 1904. 



94. Ferberite from Conger mine, Nederland, Boulder County, Colo. Analysis by 

 Ekeley, J. B., The composition of some Colorado tungsten ores: Univ. Colorado 

 Studies, vol. 6, p. 95, 1909. 



95. Ferberite (reinite) replacing scheelite, from Kimbosan, Kei, Japan. Analysis 

 by E. Schmidt. Quoted by Luedecke, Otto, Ueber Reinit, K. v Fritsch, Ein neuea 

 Wolframsaures Eisenoxydul: Neues Jahrb., 1879, p. 288. 



