249 
they unite in the absence of certain rare elements which may 
be found in other places in the pegmatite belonging to the 
rock of the alkali 
tantalum is only present in extremely small quantities. 
series. Thus boron is entirely absent, and 
The table at foot will show more distinctly the analogies 
between the Narsarsuk mineral locality and that of the Ilimausak 
batholite (Kangerdluarsuk etc.) respecting the occurrence of min- 
erals rich in zirconium, titanium, niobium, cerium metals, be- 
ryllium, and lithium. 
Min erals | Narsarsul Kangerdlu- 
rich in | | arsuk ete. 
Zirconium Eudialyte Eudialyte 
Catapleiite 
Elpidite Elpidite 
Zircon 
Titanium Neptunite Ainigmatite 
Astrophyllite Astrophyllite 
Tæniolite 
Narsarsukite 
Lorenzenite 
Leucosphenite 
Cerium metals Synchysite Steenstrupine 
Cordylite Rinkite 
Ancylite Erikite 
Britholite 
Niobium Chalcolamprite Epistolite 
Endeiolite 
Beryllium Epididymite Leucophane 
Eudidymite 
Lithium Polylithionite Polylithionite 
Tæniolite 
