34 COLORADO FERBERITK AND THE WOLFRAMITE SET 



Analyses of minerals 



No. 



Oricin.ihni.ih MS. 



WO* 



FeO. 



MnO. 



C0. 



Mco 



Other sub- 

 si Alices. 



Total. 



H.M 



a =: 



74.13 



lv. S3 



Co'.o.. 



71.01 

 75.214 



75. 47 



V.M 



24.14 



-4 S2 

 24.372 

 19.13 

 24.33 



0.67 



.51 

 .60 

 .56 

 .57 

 .37 

 .18 



.m 



.08 



0.60 



.42 



1.28 



1.32 



"."44" 



Trace. 



0.49 

 16.10 

 1.81 



.71 



Trace. 



6.45 



.71 



0.12 



Al : 0j0.2o . 

 AlsOt 2. 49 . 

 Alf Oi 0. 75 . 

 AliO, 0. 46 . 



.50 



15.94 



Trace. 



.59 



Trace. 



AUO, 2. 19 . 

 AljO,2.25. 



AljOs 3. 10 . 

 TajOj, trace. 



99.92 

 100.35 



99.75 

 100. 29 

 100.00 



99.88 

 100.59 



99.77 

 UH). 26 



86. Feiberite from Magnolia, Boulder County, Colo. Analysis by J. B. Ekeley. 

 Geoige, R. D., The main tungsten area of Boulder County, Colo.: Colorado Geol. 

 Survey First Kept., p. 42, 1909. 



87. Foberite bom Clyde Mine, Nederland, Boulder County, Colo. Analysis by 

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

 Studies, vol. 6, No. 2, p. 95, 1909. 



88. Ferberite from Elsie mine, Boulder County, Colo. Analysis by J. B. Ekeley. 

 George, R. D., The main tungsten area of Boulder County, Colo.: Colorado Geol. Sur- 

 vey Firet Rept., p. 42, 1909. 



89. Ferberite from claim near Manchester Lake, Gilpin County, Colo. Analysis by 

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

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



90. Ferberite from Puy-les-Vignes, France. Analysis by Nicolardot quoted by 

 Lacroix, A., Mineralogie de la France et de see colonies, vol. 4, pt. 1, p. 282, 1910. 

 The analysis shows a trace of SnO,. 



