156 
matter in the Kangerdluarsuk rock is not only present in smaller 
amount but it has here formed at the expence of all the salic 
minerals. 
The chemical type represented in the naujaite is of rarer 
occurrence. The writer is only aware of three other localities 
where similar rocks have been found (see analyses quoted in 
the table p. 154). At Lujavr-Urt in the peninsula of Kola the 
rock-type which is termed urtite has a chemical composition 
fairly analogous to that of the naujaite.. The similarity, how- 
ever, does not extend to the mineral composition, for the urtite 
as described by Ramsay is not sodalite-bearing. Nevertheless 
the chemical agreement is of great interest from a theoretical 
point of view, because both the urtite and the naujaite are 
associated with lujavritic rocks. A still closer agreement is 
manifest between the naujaite and certain sodalite-bearing nephe- 
line-syenites from the Los Isles and from Transvaal (see ana- 
lyses B and C, p. 154). These rocks, too, occur in connection 
with lujavrites. 
Sodalitite. 
The description given in the preceding pages refers to 
the bulk of the naujaite. A peculiar variety with exceptionally 
small and numerous sodalite-crystals has been mentioned in 
the geological chapter (p. 74). Another more divergent variety 
is the ‘sodalitite’ found at Nunasarnak in subordinate masses in 
the naujaite. It is almost exclusively made up of sodalite ex- 
hibiting the same microstructure and occurring in grains of 
the same size as in the naujaite. Small amounts of egirine, 
felspar, and eudialyte are also present in the sodalitite. 
LUJAVRITES. 
As previously mentioned the naujaite of the Ilimausak 
batholite rests upon lujavrites. As a rule the lower part of 
the naujaite-body has been split up into huge fragments or 
