72 



COLORADO FERBERITE AND THE WOLFRAMITE SERIES. 



to be so well established that references to it are in general not neces- 

 sary. The occurrence of the form on the three members of the 

 wolframite group has also been noted. 



Forms and coordinate angles, wolframite grouj). 



[a=0.8255; c=0.8664; 0=89 32'.] 



a Numbers refer to the Bibliography, pp. 74-75. 



