66 
can be picked out in large quantities from the arfvedsonite of 
the pegmatites. 
In addition to these regular pegmatitic sheets, three kinds 
of newer pegmatitic veins can be distinguished, which follow 
an irregular, winding course and are of varying thickness. The 
one kind consists chiefly of felspar crystals and arfvedsonite 
anhedra which may be over half a meter long. This kind of 
pegmatite is not rare in the Naujakasik district, but the finest 
examples are found on Nunarsuatsiak, north of Tunugdliarfik 
Fjord (see below). The pegmatitic veins of the second kind 
are much narrower and contain well-formed, prismatic crystals 
of arfvedsonite, frequently over 2 centimeters in thickness and 
imbedded in a granular aggregate of zeolites; these veins have 
been most frequently observed in the distriet east of Tuper- 
suatsiak. Lastly, the veins containing steenstrupine occur here 
and there over the whole district; as a rule they are only of 
restricted width and consist mainly of egirine, steenstrupine 
and lithium-mica, imbedded in a fine-grained albite. Sometimes 
these veins also contain schizolite. 
The sodalite-foyaite. — As already pointed out, the nau- 
jaite is covered by a rock which is here provisionally termed 
sodalite-foyaite. This rock is much like the naujaite in general 
appearance and can not be distinguished from it at a distance. 
On closer observation, however, it is seen that the sodalite- 
foyaite does not have a poikilitic but a foyaitic structure with 
thick, tabular, felspar crystals; further, the order of crystallisa- 
tion is different in the two rocks, and the sodalite-foyaite is 
considerably richer in dark-coloured minerals. 
The felspar of the sodalite-foyaite is white or grayish; the 
tabular crystals are about 2 millimeters thick and 1—2 centi- 
meters in length and breadth, but occasionally the thickness 
reaches up to 4 millimeters and the length to 5 centimeters. 
Nepheline is abundant, also sodalite, but somewhat less than 
in the naujaite, and these minerals have crystallised partly 
