76 
of naujaite with broad, irregular veins of arfvedsonite-lujavrite 
and a little ægirine-lujavrite; it is of interest chiefly as a min- 
eral locality. At the top there is an irregular pegmatitic 
segregation, probably the coarsest-grained pegmatite in the 
whole region. It contains plate-shaped crystals of felspar!, 
the thickness of which may be up to 30 centimeters, while the 
length is nearly one meter, and between the felspar plates lie 
allotriomorphic anhedra of arfvedsonite of similar dimensions. 
In the less coarse-grained portion of this pegmatite there also 
occur sodalite and nepheline, as well as a little ægirine and 
polylithionite. 
In 1900 a new mineral was found in the low coastal cliffs 
below Nunarsuatsiak, the yellow erikite, which has been de- 
scribed by О. В. Bécemp *. 
North of Nunarsuatsiak the country for a short distance is 
flat and covered with gravel; behind this level part rises the 
south-east slope of Ilimausak. At the foot of the slope the 
rock is a fine-grained arfvedsonite-lujavrite with almost horizontal, 
flat lenses of naujaite. 
From Nunarsuatsiak towards the north-east the naujaite 
lenses become gradually more scarce, until at last the cliffs 
consist of a uniform lujavrite, which here belongs to the green 
variety (ægirine-lujavrite). At the same time the dip of the 
parting planes increases, and a little more than a kilometer 
north-east of Nunarsuatsiak the egirine-lujavrite borders on the 
diabase sheets (Pl. Vi, Fig. 1 and Pl. XV). The egirine-lujavrite 
shows here a well-marked contact-facies, assuming the form of 
dense, green rock, speckled with black, short needles of arf- 
vedsonite. 
1 A complete description of this felspar, which is a microline-microper- 
thite, is given in ‘Meddelelser om Grønland” XIV, pp. 22—28 (1894), 
where this locality is called ‘“Serrarsuit”. G. FLINK mentions the same 
locality under the name ‘‘Nunarsiuatiak” (Meddelelser om Grønland XIV, 
p. 246 (1898)). 
? Meddelelser om Gronland XXVI, р. 93, (1903). 
