13 



The hitler is composed cliiefly of orthoclase and quartz besides 

 some plagiociase. The quartz is mostly micro -pegmatitically 

 inlergrown with felspar. 



The last and rather large and interesting collection of rock 

 comes from Nualik. Among the specimens collected in this 

 locality one approaches very near to those just described. It 

 is labelled «vein in the gneiss» and consists of a white pegma- 

 tite granite exactly similar in character to those just described, 

 only that the micro-pegmatitic structure is still more obvious. 

 This rock is traversed by a band of solid greenstone, 2 inches 

 wide. The latter is interesting : plagioclase appears to be its 

 chief constituent, but otherwise it consists of a decidedly homo- 

 genous mass of even-sized grains of felspar, and of almost 

 colourless pyroxene, besides some iron-ore and mica. As is 

 the case with the specimen from Lilleø, the biotite when ap- 

 proaching near to the pegmatite boundary increases both in 

 quantity and in the size of the individuals, and a fairly large 

 quantity of green hornblende occurs simultaneously. 



Among the specimens collected are several pegmatites of 

 the same nature as the one described. One specimen shows 

 a large druse with quartz crystals up to an inch in length, 

 besides felspar and some calcite. Besides these there occur 

 numerous peculiar types of rocks, among which may be men- 

 tioned a yellowish limestone, a drusy silica breccia, and two 

 stratified specimens of rock of the type of the crystalline schists. 

 One of these is a considerably weather-worn light-coloured rock, 

 the other resembles a dark schist and, examined microscopically, 

 is found to contain a very dense, granulitic mass of felspar 

 (orthoclasei, besides distinctly marked plagioclase, small evenly 

 distributed grains of ore, and an abundance of a colourless 

 monosymmetrical mineral in irregular grains, undoubtedly alight- 

 coloured pyroxene. This mass occurs alternately with thin 

 lavers consisting of light-irrev rather fibrous hornblende through 



