O. Andersen — Aventurine Feldspar. 



Table 4 



385 



AbesAiijs ; n — 1'540 



Form 



Measured 



Calculated 



from 



measurements 



Calculated 



from 

 axial ratios 



Measured 



Calculated 



from 

 axial ratios 











Pole : Normal to 001 ( p P and P ) 









112 



46° 



40' 



20° 



53' 



20° 47' 



20° 43' 



58° 



7' 



58° 41' 





72 



40 



6 



5 



21 7 



59 



11 



112 



46 



55 



23 



20 



21 36 



21 44 



56 



9 



56 23 



72 



32 



7 



48 



21 42 



57 



8 



113 



46 



56 



17 



12 



19 42 



19 35 



56 



9 



56 23 





*62 



24 



31 



29 



46 53 



46 48 













021 



2 69 



20 



25 



4 



46 47 

















s 69 



42 



25 



27 



46 37 













Pole : Normal to 010 ( p M and M ) 



150 



150 



48 58 



14 50 



57 7 



8 50 



58 4 



8 58 



48 29 



13 55 



56 48 



8 32 



19 



22 



19 



24 



19 



38 



19 



2 



19 14 



19 28 



19 18 



64 



2 



63 



51 



63 



21 



63 



53 



63 



38 



63 31 



1 X = 93° 37' 



» A = 93° 55' 



3 A = 93° 57' 



The feldspar consisted of large, single individuals, or was 

 sometimes composed of broad twinning lamellae after the albite 

 law. 



The hematite lamellce. — As the lamellae were large and pres- 

 ent in great numbers the aventurization was exceedingly strong, 

 especially on (001). 



Large lamellae, measuring 2 X l mm or more, were numerous, 

 but all sizes down to the very smallest were seen. 



The outlines were sometimes six-sided and often rhomb- 

 shaped or elongated. Eight-sided or quite irregular outlines 

 were also frequently seen. (Plate II, fig. 1.) 



Opaque hexagonal lamellae were sometimes arranged in regu- 

 lar groups with the edges of each lamella parallel to the six- 

 sided outlines of the groups. 



