eleolite, biotite, diopside and aegirine in large quantities. 1 he eleolite 

 frequently changes into analcite. The rock, though quite acid, as the 

 analysis shows, is nevertheless an eleolite syenite, closely similar to 

 laurdalite. 2 



SiO, A1 2 ;1 Fe 2 3 CaO MgO K 2 Xa 2 H 2 

 59.70 18.85 4.85 1.34 .68 5.97 6.29 1.88 

 In and around the mountain are small dykes, filled with ' brown 

 granite,' miarolitic eleolite-syenite and quartz syenite. The brown 

 granite is an eleolite-syenite containing orthoclase, dio] m» 

 and biotite, but no amphibole. In chemical composition it is quite 

 like nordmarkite, 3 but mineralogically it is very different. The miar- 

 olitic rocks are panidiomorphically granular. In the eleolite-svenite 

 there is a tendency of the eleolite toward isomorphic forms when it 

 is not in large quantity. In the quartz syenites the quartz tends 

 toward idiomorphism. An analysis of one of these rocks gave : 



Si0 2 A1 2 0, Fe 2 3 MnO CaO MgO K,0 Nap H 2 

 64.63 18.15 3.05 1.00 1.54 .60 4.79 5.80 1.08 



Rocks, called by the author border rocks, presumably <■ 



peripheries of dykes and bosses of the eleolite-syenite, contain tabular 



l Zeits. f. Kryst., xvi, p. 28. 



