41 
minerals of the rocks. In some cases the arfvedsonite forms 
irregular but fairly isometric anhedra of up to 2—3 centimeters 
in diameter; in others it forms prisms of 1/2 to 11/2 centimeters 
in length and some few millimeters in thickness. In the egirine- 
lujavrite near the mouth of the Lille Ely and at a few other 
places the arfvedsonite prisms are in radiating groups, which 
remind one of the turmaline ‘stars’ of certain granites and give 
the green rock a very pleasing appearance; but as a rule the 
arfvedsonite prisms are irregularly scattered. 
The egirine-lujavrite lacks these black arfvedsonite spots 
at many places; in such cases, however, close observation shows, 
that the arfvedsonite has been present originally but has been 
replaced by a brown inconspicuous substance which consists of 
acmite. This alteration of the arfvedsonite is also common 
in the pegmatitic veins and has been described on an earlier 
occasion. 
When exposed to the atmosphere the lujavrites are inclined 
to split asunder, though not to such a great extent as the 
naujaite. Whilst the lattter crumbles to gravel-like debris, the 
lujavrite splits into large, plate-like fragments, which at many 
places form screes difficult to pass. 
THE PLATEAU OF KRINGLERNE. 
General features. — The high plateau which is called 
‘‘Kringlerne” is the most peculiar rocky mass in appearance in 
the whole region, and in geological regards is perhaps without 
parallel in the world. Towards the Kangerdluarsuk Fjord, 
Kringlerne present an abrupt fall, a naked, whitish gray wall, 
in which we can count about 40 black bands (Pl. У, Fig. 3 and 
Pl. IX). These run to some extent horizontally and, seen from 
a distance, seem to have great uniformity in thickness with 
= PER M de 
Por | dr” 
~*~ 
! Meddelelser om Grenland XIV, p. 198 (1894). 
