J. SCHETELIG. 



M.-N. Kl. 



The amphibole is common green hornblende with abs. y'> ß^ a, a 

 h'ght yellow, ß light brownish green, y deeper bluish green. In sections 

 -i- ß the angle c/= 20° — 24°. In only one individual a nucleus of brown 

 amphibole is observed in the green. The amphibole contains inclusions 

 of iron-ore, sometimes arranged in parallel lines. 



The biotite shows strong absorption, ß and y deep brown, a straw 

 yellow. The mineral is partly altered into chlorite. The reciprocal ratio 

 between the contents of amphibole and biotite is variable ; in some slices 

 amphibole is prominent, in others biotite. 



Fig. II. Amphibolite (analysed). Scotts Nunataks. Intergrowth of bytovvnite and quartz. 

 Micro-photo. Niçois +. Enlarg. 17. 



One slice contains a mineral belonging to the chlorite-group (opt. neg.), 

 arranged in small spherulitic nodules. 



The contents of quartz varies in the different slices as well as in different 

 parts of the same slice. A considerable portion of the quartz is met with 

 in intergrowth with the plagioclase; the different grains of quartz in one 

 individual of plagioclase always show simultaneous extinction, hence they 

 belong to the same individual. For the rest, quartz occurs as irregular 

 grains unequally distributed in the slices. The grains are cracked and 

 show undulatory extinction. 



At my request Dr. Naima Sahlbom kindly undertook the chemical 

 analysis of this rock. For the analysis a specimen was selected with 

 predominant amphibole. 



