32 
than a kilometer in west to east direction, the cliffs along the 
shore consist of the rock which is the most characteristic of 
the whole region and which in 1878 was called sodalite-syenite 
by Steenstrup", The same name was later used by Linperen 
for quite a different rock and by Навзен for a third kind; it is 
also objectionable in so far, that the Greenland rock does not 
belong to the family of syenites but to the nepheline-syenites. 
In the sequel, therefore, Sreensrrup’s sodalite-syenite will be 
called naujaite (from the locality Naujakasik). 
Naujaite is a nepheline-syenite extremely rich in sodalite 
and with a characteristic poikilitic structure (Pl. XVII). The 
rock is composed of alkali-felspar, nepheline, ægirine, arfved- 
sonite and eudialyte in crystals, which can often be measured 
in decimeters; and all these minerals are tightly and uniformly 
speckled with sodalite crystals, the diameter of which as a rule 
does not exceed half a centimeter. Each crystal of the first- 
mentioned minerals may contain several hundred sodalite crystals, 
and these lie so close, without touching one another, that the 
rock as a whole contains from 30 to 60 per cent of sodalite. 
All the constituents are fresh and the light-coloured min- 
erals are semi-transparent; the sodalite green or bluish green, 
the nepheline whitish or grayish, the felspar greenish. The 
eudialyte is of a fine bluish red and along with the coal-black 
cleavage-surfaces of the ægirine and arfvedsonite gives the face 
of the cliffs a beautifully variegated appearance, when seen close 
at hand. The eudialyte in the rock varies greatly in amount; 
at some places it is only seen as small spots (2 or 3 centimers 
in diameter) here and there, at others it may appear in such 
abundance that it seems to compose a fourth of the whole rock. 
In the latter case the crystals of eudialyte reach a size of 
25 centimeters or more and enclose a very large amount of 
sodalite crystals. 
1 Meddelelser om Grönland, II, 1881, р. 35. 
