97 
formed beautiful crystals of epidote 3—4 millimeters long are 
found. A true vein of essexite-pegmatite, half a meter wide, 
was found in the essexite cliffs near Panernak Bay; it is com- 
posed of felspar and pyroxene in crystals often exceeding 10 
centimeters. 
Contact relations. — The junction of the essexite and 
sandstone is exposed in the low cliffs of the coast, about one 
kilometer south-east of Narsak. The essexite shows a well- 
marked contact-facies almost 12 meters broad. This is a por- 
phyritic rock crowded with large, white phenocrysts of felspar, 
while the ground-mass is a medium-grained essexite; the fel- 
spar phenocrysts are up to 14 centimeters in length and 2—3 
centimeters in thickness. Immediately at the junction with the 
sandstone the rock changes to a dark-green, serpentine-like, 
decayed mass without phenocrysts. The contact-plane is not 
vertical but has an inclination of 20—30° towards the south- 
east; the essexite is thus partially covered by the sandstone. 
— At Sigsardlugtok (7 kilometers west of Narsak) the essexite 
shows a gradual decrease in size of grain towards the adjoining 
Algonkian granite. 
Magnetite-pyroxenite. — Two kilometers north-west of 
Narsak a narrow point runs out towards the N. W., separating 
Panernak Bay from the sea. On the outer side of this point 
the essexite contains a small mass of black, fine-grained mag- 
netite-pyroxenite, not very different in appearance from the 
well-known magnetite-olivinite from Taberg in Sweden. This 
mass extends for at least 40 meters from N.W. to S.E.and at 
least 15 meters at right angles to this direction. The contact 
between this rock and the surrounding essexite was not inves- 
tigated. 
Dykes cutting the essexite. — The essexite is traversed by 
a number of dykes which may be briefly mentioned at this 
place. | 
(1) Two dykes of a syenite-porphyry (or sölvsbergite) occur 
XXXVIII. 7 
