189 
facies described below. In both cases it is no doubt derived 
from the absorption of sandstone or granite. 
Structure. — The most peculiar structural feature is the 
agglomeration of the femic ferromagnesian minerals which is 
essentially of the same kind as in the Larvik-type. The pyr- 
oxenes and amphiboles are generally arranged like a cover, 
round a core, consisting now of a single crystal of iron-ore 
or olivine, now of a small aggregate of crystals of both these 
minerals and apatite. The augite is generally found nearest the 
core and surrounded by hornblende in parallel position. The 
barkevikite is sometimes seen as a narrow band between the 
iron-ore and the augite, and aggregates of biotite-crystals as a 
rule surround those areas of iron-ore which are not intergrown 
with the augite. 
Chemical composition. — A specimen of the typical augite- 
syenite, taken at the foot of the Nunasarnausak, on the north 
coast of Kangerdluarsuk, has been analyzed by Dr. WiıntHEr 
with the following results (No. 16). For the sake of comparison 
two analyses of the original Larvik-type from Norway have also 
been given. As will be seen by the figures the conformity is 
not as great as might be expected from the similarity in mi- 
neral composition, the Greenlandic rock differing from the Nor- 
wegian in alumina, ferrous oxide, and alkalies. On the other 
hand, if the analysis of the augite-syenite is compared with 
that of the pulaskite (analysis No. 3, see p. 124), a very close 
conformity between these two rocks will be discovered. 
Contact facies of augite-syenite. 
Normal contact facies. — Where the augite-syenite bor- 
ders on the old granite, it often shows an endomorphic contact 
modification which may be characterized as a fine-grained and 
sometimes rather porphyritic variety of the common augite- 
syenite. At the immediate contact the rock is in some places 
— €. g. at the foot of Iviangusat — richer in dark-coloured 
