A. Urtite, Lujavr-Urt, Kola. A. Zituracus, analyst (W. Ramsay, 
Das Nephelinsyenitgebiet auf der Halbinsel Kola II. Fennia 
NAN or 2 1999 р. 22) 
В. Nepheline-syenite, rich in sodalite, Los Isles. Е. Pisaxr, 
analyst (A. Lacroix, Sur les facies de variation de certaines 
syénites néphéliniques des îles di Los. Comptes rendus 
CXLII, 1906, р. 684). 
C. Nepheline-syenite, rich in sodalite, Zeekoegat, Transwaal. 
Г. Pisani, analyst (H. A. Brouwer, Transwaalsche Nephelien- 
svenieten. s’Gravenhage 1910, p. 42). 
Naujaite Naujaite 
analysis No. 6 analysis No. 7 
Kangerdluarsuk Nunasarnak 
Per cent. Per cent. nenn 
sodalite.... 31 54 < 
nepheline . 18 5 
eudialyte 3 2 / 
microcline 20 6 Е 
albite. 10 — | 
ainigmatite . — 2 \ 
egirine ... 10 12 N 
arfvedsonite . 1 5 Neg } 
analeime 7 14 SE = 
100 100 
The figures given in this table at once show that the 
salient feature of this rock is the extraordinarily high amount 
of sodalite. They also show that the naujaite of Nunasarnak is 
still richer in sodalite than the Kangerdluarsuk variety while on 
the other hand felspar and nepheline are considerably lower 
in the former rock. These differences in as far as sodalite and 
nepheline are concerned express an original variation in the 
composition. As to the amounts of felspar, however, the 
original difference is much inferior to that indicated by the 
analyses. The microscopical examination shows that the large 
amount of analcime found in the Nunasarnak naujaite has 
formed mainly at the expense of felspar, while the zeolitic 
