131 
from direct observation. Probably they are the latest crystallized 
minerals of the rock since they fill out even the narrowest inter- 
stices between the felspar crystals. 
From what has been said above it will be seen that the 
sequence of crystallization of the dark-coloured minerals broadly 
speaking is as follows: — 
First, scarce crystals of iron-ore; next, olivine, biotite, 
ainigmatite, and egirine-augite; after this, under partial resorp- 
tion of the minerals first enumerated, magnetite, biotite in scaly 
aggregates, catophorite-like hornblende, and egirine, and finally, 
during the last phase of the consolidation, only ægirine and 
arfvedsonite. It is further to be noted that the ægirine here, 
as in most other nepheline-syenites, has crystallized during the 
entire epoch of consolidation: (1) it is found as minute prisms 
enclosed in the felspars; (2) it occurs, though very sparingly, 
as a little larger crystals which are idiomorphic against the 
felspar; (3) it surrounds the egirine-augite and is present in 
some of the resorption bands mentioned above; (4) it appears 
as one of the latest crystallized minerals of the rock. The 
arfvedsonite has a similar wide range of crystallization. On 
the other hand, the structure of the rock proves with cer- 
tainty that the greater part of the ægirine and of the arfvedso- 
nite has crystallized during the latest stage of the consolidation- 
process. 
Chemical composition. — A specimen of the foyaite, taken 
on the mountain-plateau above Naujakasik, has been analysed 
by Mr. С. Dertersen with the results given in No.4 in the table 
p- 132. The composition on the whole is not very different 
from that of the most common type of nepheline-syenites. The 
closest related rocks outside of Greenland are found within 
the igneous complexes of Kola and of the Los Islands. Two 
analyses of rocks from these localities are quoted for compar- 
ison (A and B). Considering the analogy between the South 
Greenlandic igneous complexes and those of the Christiania 
gr 
