COLORADO FERBERITE AND Till. \\ ( )l I !; A M I I K SERIES. 



73 



COMBINATIONS OBSERVED ON THE WOLFRAMITE GROUP. 



The following table shows the combinations described on minerals 

 of the wolframite group commencing with the definite establishment 

 of the monoclinic character of the group by Descloizeaux in 1850. 

 As wolframite was considered to be orthorhombic in the earlier 

 descriptions, the combinations of those writers are not given, a-, the 

 positive and negative forms can not be differentiated. Numbers 

 after names of authors refer to similar numbers in the bibliography. 



Combination No. 10 gives the entire list of forms mentioned by 

 Descloizeaux and doubtless represents several crystals, in part prob- 

 ably the same as combinations Nos. 1, 2, and 3. Combination 11 

 likewise gives the complete list of forms observed by Jeremejew, os 

 I was not able to decipher the individual combinations from the 

 Russian text. 



Combinations described on crystals of minerals of the wolframite group. 



a Eakle states that "All of the material contains iron and is to be classed as wolframite rather than as 

 hubnerite." His next sentence, " The crystals are tabular parallel to the orthopinacoid and some of them 

 are exceedingly thin and almost transparent, with a deep-red color," would indicate, however, that the 

 material was more likely hubnerite than wolframite. 



