151 
(the minute prisms enclosed in the sodalite etc. are here left 
out of consideration) the egirine, though mainly interstitial, 
shows traces of idiomorphism towards the felspar. At their 
mutual boundaries neither ægirine nor arfvedsonite shows idio- 
morphic outlines. The optical character of the ægirine and the 
arfvedsonite of this rock indicate that both are typical repre- 
sentatives of these mineral species. The well-known analyses of 
ægirine and arfvedsonite from ‘Kangerdluarsuk by Lorenzen, 
Dortrer, and Brerwerts refer to specimens from the pegmatites 
of the naujaite. 
The eudialyte is present in widely varying amount in this 
rock: in some places it is abundant, in others it orcurs as а 
very subordinate constituent. It is in fresh red crystals of 
similar large dimensions as the felspar, and as a rule it is a 
little more idiomorphic than the latter mineral. It is always 
closely dotted with sodalite-crystals, while inclusions of other 
kinds are very rare. Optically it agrees with the typical variety 
of eudialyte found in the pegmatites of the naujaite’ and ana- 
lysed by Lorenzen and RAMMELSBERG. 
As mentioned above the number of minor accessories 
occurring in the naujaite is rather considerable but most of 
them are very rare. It deserves notice that iron-ore is entirely 
absent. Also apatite is extraordinarily scarce; only in a few 
slices three or four minute prisms have been observed, imbed- 
ded in sodalite or nepheline. Small scales of brown bvotite 
occur rather commonly as a thin coating on those nepheline- 
crystals which are imbedded in the arfvedsonite. Sphalerite has 
been found in small grains, enclosed in ægirine, and in crystals 
surrounded by analcime; in thin slices it is of a yellowish 
brown colour. Among the other accessories, mentioned above 
(p. 144), only the rosenbuschite needs a more detailed descrip- 
tion as this mineral has not been found previously in Green- 
' Meddelelser om Grønland XIV, р. 147 (1894). 
