394 



0. Andersen— Aventurine Feldspar. 

 Table 10 



Microcline ; n = 1'523 





Measured 



P 



t 



Form 



i 



r 



Calculated 



from 



measurements 



Calculated 



from 

 axial ratios 



Measured 



Calculated 



from 

 axial ratios 











Pole 



: Normal to 001 ( p P and P ) 









51° 



27' 



16° 



55' 



20° 58' 



20° 57' 



56° 



16' 





112 



51 



50 



16 



18 



20 51 



56 



24 



56° 38' 





64 



50 



8 



19 



20 57 



56 



23 







65 



4 



8 



4 



20 54 



56 



46 













Pole 



: Normal to 010 ( p M and M ) 









55 



3 



6 



39 



18 28 



18 41 



63 



47 





150 



55 



31 



6 



48 



18 37 



63 



57 



63 57 





59 



13 



4 



46 



18 44 



63 



20 





Orientation of the lamellce. — Table 11 contains the gonio- 

 metric measurements. The following faces were planes of 

 orientation : (001), (010), (112), (112), (150), (150). Of these 

 only (112), (112), (150) and (150) contained a large number of 

 lamellae. After (001) and (010) there were very few. 



Table 11 



Microcline ; n = 1" 523 



Form 



Measured 



Calculated Calculated 



from from 



measurements axial ratios 



Calculated 

 Measured from 



axial ratios 







Pole 



: Normal to 001 ( p P and <j> v ) 





112 



57° 7' 



13° 27' 



21° 2' 



20° 57' 



57° 21' 



56° 38' 







Pole 



: Normal to 010 ( p M and M ) 





150 



52 27 



10 



18 57 



18 41 



64 38 



63 57 



