70 



COLORADO FEEBEEITE AND THE WOLFRAMITE SERIES. 



0{095}, found only by Descloizeaux, also needs verification. The 

 measured angle agrees much better with the slightly more complex 

 form {0.11.6}. 



(Oil) : (095) =16 47' (measured by Descloizeaux). 

 (Oil) : (095) =16 26' (calculated); difference =+21'. 

 (Oil) : (0.11.6)=16 54' (calculated); difference =-07'. 



The form is therefore considered doubtful, on account of the un- 

 certainty of its symbol and because it needs verification. 



FIGURE 35. Gnomonic projection of forms of the wolframite group. Several forms are plotted in twin 

 position (open circle) to show their close position to untwinned forms. Thus note particularly c and w, 

 5 and t, g and <r, t and s, s and s, 4 and V. 



{304}, described only by Groth and Arzruni, is also doubtful, as 

 the measured angles vary considerably from the values calculated 

 for them. 



Angles for the form {304}. 



