130 
In one specimen — the same of which a chemical analysis 
is given below — the prevailing dark-coloured minerals are 
catophorite-like hornblende, ægirine, and ainigmatite. The 
ainigmatite has been partially converted into an aggregate of 
iron ore and biotite; besides, it is often surrounded by a zone 
or fringe which consists of an egirine-aggregate of irregular 
columnar structure. Where the ainigmatite has altered, this 
ægirine-zone follows the original contours of the mineral. Ægi- 
rine is also found in large anhedra. Some of these are homo- 
geneous; more commonly, however, each egirine anhedron 
only forms an outer shell enveloping a pseudomorph. ‘These 
pseudomorphs are of three kinds: some consist entirely of 
an aggregate of catophorite-like hornblende; others are ag- 
gregates of brown biotite; others, again, contain both horn- 
blende and biotite. It is probable that these pseudomorphs 
have originated from egirine-augite by a resorption-process. 
The catophorite-like hornblende also occurs separately as large 
anhedra which are sometimes surrounded by a narrow fringe of 
columnar egirine. 
Another specimen, taken directly below the pulaskite-sheet 
near North Siorarsuit, contains abundant olivine which is sur- 
rounded by the above-mentioned rim of iron ore with some 
biotite. Ægirine-augite, too, occurs abundantly; this as usual 
has an outer zone of intensely green egirine. Both olivine 
and ægirine-augite are frequently enveloped by large anhedra 
of catophorite-like hornblende with a dark-coloured, arfvedso- 
nite-like outer margin around which a last resorption-band is 
found, consisting of fine-grained ægirine with some biotite. In 
so far the sequence of crystallization is well marked. But in 
the same slices a few grains of ainigmatite are also found, and 
these are only surrounded by a zone of fine-grained ægi- 
rine. Finally ordinary ægirine and arfvedsonite are present in 
large anhedra bounded only by light-coloured minerals so that 
their age in relation to the other dark minerals is not evident 
