195 
felspar, while the quartz appears as the mineral last cry- 
stallized. 
Chemical composition. — For the chemical analysis speci- 
mens were taken of a tolerably fresh rock from a spot on the 
west side of Kakarsuak near Narsak. The rock in this place 
is, howerer, not quite typical in so far as it is practically free 
from quartz. The mineral composition is as follows: soda- 
orthoclase with some oligoclase, green and brown hornblende, 
colourless or grayish augite, some biotite, iron-ore and apatite, 
finally a little hydrous iron oxide, arisen from decomposition of 
the ferromagnesian minerals. 
The result of the analysis which was carried out by Dr. 
Winter has been given in No. 17 of the table on the next 
page. For comparison two analyses of the typical nordmarkite 
(В and С) have also been given. These show a somewhat 
greater content of silica and alumina and a slightly lower con- 
tent of lime, while the amount of alkali is equal in the Green- 
landic and Norwegian nordmarkite. The Narsak rock shows a 
still greater conformity with the pulaskite from North Siorarsuit 
(analysis No. 3, p. 124), from which it chiefly differs by a lower 
content of iron and a slightly higher content of alumina, lime, 
and phosporic pentoxide. From a purely chemical point of view 
the analyzed nordmarkite variety from Narsak might be sup- 
posed to be a pulaskite variety, but from a geological point of 
view it belongs to a well characterized nordmarkite-mass and its 
low percentage of silica is accounted for by the fact that the 
material for the analysis was accidentally taken in a place where 
the rock was exceptionally poor in quartz. 
Rock-types that are closely related to the one here de- 
scribed occur pretty frequently all over the globe. In this place 
the very close agreement in chemical composition with the 
nordmarkite from Cabo Frio, described and analyzed by F. E. 
Wricar, is especially pointed out. The analysis of this rock 
has been given for comparison (in A). A comparison with the 
13: 
