FAYAITE-IJOLITE SERIES OF MAGNET COVE 619 



variable constituent in the Finland ijolites. Hackman {^op. cit., 

 p. 4) notes the identity between the Magnet Cove rock and the 

 Finland and Alno ijolites. 



Biotite-ijolite. — An analysis was also made of this rock, the 

 specimen coming from near the Baptist church, and the results 

 are given in I. My specimen was, unfortunately far from fresh, 

 so that the figures are of little value. Williams' analysis (II) 

 of the same type, undoubtedly made on fresher material, is to 

 be preferred. The chief feature of interest in I is the (for this 

 oxide) large amount of ZrOg, which may be correlated with the 

 neighboring "eudialyte-syenite pegmatite" described by Wil- 

 liams. 



The composition of the rock is such that any calculation of 

 the mineralogical composition must be rather arbitrary and 

 unsatisfactory, but the following (Ila) represents roughly and 



Orthoclase 

 Nephelite 

 Biotite 

 Diopside 

 Melanite 

 Schorlomite 

 Magnetite - 

 Apatite - 



Ila. 



4.8 



24.1 



6.2 



30.6 



23.0 



6.7 



3-6 



i.o 



FeS«. 



'Williams gives 100.57. 



