13i 



schizolite are almost never found in the last-named minerals, 

 so that they accordingly have only begun to be formed, when 

 these minerals were completely formed, or only a little before 

 this time. The relation of age between the schizolite and the 

 small crystals of aegirine is somewhat varying; most frequently 

 the latter have been formed first, so that they penetrate the 

 schizolite in all directions. 



The occurrence at Naujakasik is essentially different 

 from the preceding ones, the schizolite being here found in 

 typical sodalite-syenite-pegmatite, consisting of microcline-micro- 

 perlite, arfvedsonite, aegirine, eudialyte, sodalite, nepheline, and 

 zinnwaldite, and more accessorily steenstrupite and rinkite, 

 which latter mineral resembles shizolile very much. The schi- 

 zolite is in most cases older than the principal minerals of 

 the pegmatite, and therefore those individuals, imbedded between 

 these , have most frequently their own crystalline form ; the 

 best crystals, figured in figs. 5 — 10, are, however, found in 

 cavities in the pegmatite, and, when this is the case, they are 

 often provided with very bright faces; of such crystals we 

 have, however, only a slight material. Besides there are some- 

 times found in the cavities small crystals of natrolite; but as 

 a rule the walls of the cavities are formed of the principal 

 minerals of the pegmatite itself. 



Chemical properties. 



By heating in a closed tube a small quantity of water is 

 disengaged ; before the blow-pipe the schizolite is easily melted 

 to a slightly yellowish-green, transparent glass. With borax 

 and phosphoric salt the mineral gives manganese reaction and 

 slight iron reaction. It is decomposed by acids, without gela- 

 tinization. 



In order to substantiate that the mineral from Kangerd- 

 luarsuk was identical with the varieties examined by Win- 

 ther, an analysis was made by cand. polyt. Chr. Christensen 



