25B 



3,174. The refmclive indices of the origiiuil substance were: n^ = 1 ,661 

 and n, =z 1,669, witii apparently a somewhat weaker birefringence 

 as for the ah-eadv described kunzites. 



Kunzile of JIadagascur, lieated fur two hours 



at 1'60^ G. and not yet perceptibly transformed. 



(X Nicols). 



Fig. 6. 



Beginning of the transformation of ;^-spodumene 



(Madagascar), after being heated during eight hours 



at 975° C. (X iNicols). 



Fig. 7. 

 Kunzite of Madagascar, completely transformed into 

 tie |3-form, after being heated atj)75° G. (X Nicols). 



