12 



compact hornblende, plagioclase, orthoclasè, quartz, some garnet, 

 and ore, and titanite. The structure is that of the crystalline 

 schists, without any distinct chronological succession between 

 the minerals. 



Some few specimens from Cape Jörgensen seem to be 

 variations of the above-mentioned rock, viz. an unusually coarse 

 crystalline diabase of the Ashy type, consisting of diallagic 

 pyroxene, plagioclase, comparatively fresh olivine, brown horn- 

 blende and large grains of ore without leucoxene, but surrounded 

 by brown mica. 



The rock from Ikerasarmiut^) belongs to the basaltic type, 

 but has undergone considerable alteration. I could not as- 

 certain for certain whether it contained olivine. 



A specimen of rock from the coast of Storø ^) belongs to 

 quite a different type, as it shows contact between a white 

 pegmatitic granite, containing elements of quartz and felspar, 

 which when occurring on large flats of druses are crystallo- 

 graphically well developed, and a dark-green porphyrite, which 

 may most properly be regarded as the main rock. The latter 

 consists of elongated prismatic crystals of plagioclase lying in 

 a mass of irregular-shaped individuals of hornblende and biotite, 

 which partly merge into the edges of the crystals of plagioclase ; 

 it also contains evenly disseminated grains of iron-ore. Mica 

 and hornblende, on the other hand, often occur crowded together 

 in compact masses, looking on the exterior of the rock Uke 

 homogenous crystals of some kind of basic mineral. The boun- 

 dary line between this rock and the granite is not very definite. 



') The promontory opposite Storø lat. 67° 4' N. and long. 33° 20' W. 



=*) Lat. 66° 55' N. and long. 33° 34' W. The northern coast of this island 

 consists of porphyrite in the form of a very large dyke, bnt very much 

 brolcen down, and well-preserved only where it is covered by pegmatite 

 which forms a small promontory. The main part of the island consisted 

 of crystalline schists. As far as 1 could judge from a distance, the 

 pegmatite occurred in situ on the mainland about 5 miles westward, 

 bnt only tor a short distance (dyke), С Kruuse. 



