^GIRINE-AUGITE CRYSTALS 151 



The presence of the forms z and e is remarkable, as they apparently have not been 

 observed on pcgirine, though they commonly occur on iron-rich diopside.* 



The edges between m and u and m and z are bevelled — no signal could be obtained 

 from them, so that they are probably due to corrosion. 



The elements calculated from the above forms gave the following results : 



a : b : c = 1 '08909 : 1 : 0-600116. 



8 =74° 23' 



* Zambonini, F., "Die Morphotropischcn Beziehungen zwischen Enstatit, Diopsid, Hedcnbergit, 

 Agirin mid Spodumen," Zeits. fur Kryst., xlvi, 1909, pp. 1-72. 



