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dark-brown mica. This conversion is intimately connected with 
the intense red colouring of the rock and is probably due to 
pneumatolytical actions. Of this rock no chemical analysis has 
been made, but the characters observed of the salic minerals 
show that the rock, chemically, may be characterised as an 
alkali-syenite rich in silica. 
PULASKITE. 
The pulaskite constitutes a sheet of varying thickness (from 
10 to 30 meters or more) which covers the uppermost sheets 
of the nepheline-syenitic complex. It occurs both south and 
north of Tunugdliarfik. North of this fjord it is overlain by 
the arfvedsonite-granite just mentioned. South of the fjord 
erosion has only left a very small remnant of the arfvedsonite- 
granite (near Tupersuatsiak) and the pulaskite, therefore, is as 
a rule uncovered. | 
As to outer habit the pulaskite may be described as а 
coarse-grained rock in most cases of white colour consisting 
of rather thick tabular felspar crystals and dark minerals 
filling out the interspaces between the felspars. Chemically 
this rock is closely related to the syenites of the unstratified, 
western and southern parts of the batholite (augite-syenite and 
nordmarkite). 
Microscopic characters. — Under the microscope the 
following minerals are seen: felspar, arfvedsonite, ægirine, ægi- 
rine-augite, biotite; in small quantities also magnetite and fluo- 
rite; zeolites and a mineral that is probably catapleiite occur 
as secondary products. The original presence of scarce grains 
of nepheline, ainigmatite, and eudialyte is indicated by pseudo- 
morphs observed in some specimens of the rock. 
The felspar crystals are of a form giving rectangular sec- 
tions е. ©. 6 millimeters long by 1°5 millimeter broad. They are 
