86 



l'K.NTÏI F.SKOI.A. 



M.-X. Kl. 



Anotlur spcciiiicn Iniiii ()kk( ii, collccicd \)y Tli. Kjcnilf and Krohn, 

 exhibits a cc)ars{lv .^rantilar lock in which about .a half of the mass is 

 feldspar and the other halt' «garnet, hypersthene and hornblende, all approxi- 

 mately in e(|iial aniotinls, and Miy little black pigment-like iron ore in all 

 the inalic- minerals. 



I determined the reh-in,i;ence of this garnet, r)l)taining 



Fig. 13. Dark inclusions in labradorite-rock. Fodnaes, Laerdalsfjord. 

 '/2 of the natural size. 



Hence the probable composition should be Fe^^Mg^^jCaj^, or this garnet 

 should contain still larger amounts of the magnesia compound than the 

 garnet from Aurlandsfjord. 



The hornblende is very pale green, the hypersthene shows faint 

 pleochroism. Their axial angles are of the same order of magnitude as in 

 these minerals in die inclusions near Aurlandsfjord. 



The plagioclase is about Ab.^j or Ab^.^, showing, in sections _|_ PM 

 extinction angles of 37"". 



hi this plagioclase I noticed a special kind of zonal development which 

 seems to deserve some description: at its borders towards the hornblende 

 there are zones of moi^e sodic mixtures, but not where it meets other 

 minerals. This accords with the general rule that the formation ot hornblende 

 takes place at the expense of the anordiite. 



