The Mineral Resources of Greenland. 
rule elsewhere in the 
region. The granite prac- 
tically encloses the cryo- 
lite mass, but, at the 
southwest end some 6m 
(20 feet) of pegmatitic 
material lies between it 
andthe ore and at other 
points there is a little 
pegmatite between the 
two. The granite imme- 
diately above this peg- 
matite is so cut by peg- 
matite apophyses as to 
be a granite - pegmatite 
breccia. The cryolite 
then is enclosed by a 
discontinuous shell of 
pegmatite beyond which 
is a broader shell of 
granite. 
According to A. E. 
TORNEBOHM!) there is 
in the vicinity of Ivigtut 
a stock-like mass of 
foyaite, but this was not 
seen by the writer. Ш 
QuaALeEs’ (1866) obser- 
vation that in the cry- 
olite mass are masses 
not only of granite gneiss 
but also diabase is cor- 
rectioyaitemay possibly 
be the parent mass of 
the pegmatitic cryolite 
body. The foyaite is 
usually fine-grained,but, 
in instances, coarse 
grained and consists of 
lenticular  orthoclase, 
elaeolite, aegirine and 
1) Geol. Fören. i Stock- 
holm Fôrh. VI, 1883, p.692. 
21 
Fig. 8. Cryolite open cut at Ivigtut. 
