22 
zone of very varying width surrounding the arfvedsonite; the 
egirine in this case encloses irregular patches of arfved- 
sonite showing the same optic orientation as the main individual. 
The appearance of this intergrowth is such as to suggest a con- 
version of arfvedsonite into ægirine having occurred towards 
the final stages of the consolidation of the rock. Sometimes 
egirine is also found in independent crystals; on the whole, 
however, this mineral occurs very sparingly in the typical 
arfvedsonite-granite. It is a little more abundant in those 
varieties where the arfvedsonite contains a catophorite-like 
nucleus. 
Ainigmatite has been found in almost all specimens of 
arfvedsonite-granite from [limausak and also in the specimens 
from Tupersuatsiak. It occurs as irregular or elongated grains 
of rather small dimensions (less than one millimeter). The 
mineral is easily recognisable by its cleavage and by its deep 
brownish red or black absorption-tints. As a rule it is asso- 
ciated with the arfvedsonite, and it is often enclosed within 
this mineral. Sometimes it is partly converted into a black 
metallic substance, probably titano-magnetite; a titanite-like al- 
teration product is rarely seen. 
Zircon has only been found in one specimen. Small yel- 
low pyrochlore-like crystals (optically isotropic) are somewhat 
commoner. In one specimen of greenish arfvedsonite-granite 
collected at an altitude of 830 meters, above N. Siorarsuit, a 
fibrous, light brick-red mineral is found rather abundantly. 
Owing to the finely fibrous structure no goniometric measure- 
ments could be obtained, but the mineral agrees, both macro- 
scopically and microscopically, with elpedite.! 
Among the secondary minerals of the arfvedsonite-granite 
fluorite is the most common, especially in the red varieties of 
the rock. Calcite has only been found in quite inconsiderable 
1] am informed by Professor BRÖGGER, that he has found elpidite as an 
accessory in the soda-granites N. of Christiania. 
