30 



LINES 01 I II 



1. BMcntU] Consiiiuent. II \ . \ 



Nepheline . 

 Hauvnc. . . . 



In some volcanic rocks in minute 

 prisms ; also massive in mctamorplm- 

 rocks. 



Only found in jx .ivas. 



Il.uiVnc. a volcanic mitx i 

 Li!-- geological date, said to occur in 

 almost all phnnolites. 



At 'und mi in old crystalline rocks, both 

 massive and foliated granite, RI 



son. etc. ; also in sand- 

 stones of all ages. 



Almnd.int in many crystalline rot , 



n occasional alteration-product in 

 many hornblendic and augitic rocks, 

 and in sedimentary rocks in the aureole 

 of metamorphism round .qi 



Abundantly diffused through some 

 imtamorphic slates, hence called 

 chiastolite-slates. 



In small granular forms in some cr 

 line rocks, e.g. kyanitc--rock ; also in 

 beds and veins in gneiss and other 

 schists. 



In some granites, and in the veins as- 

 sociated with and proceeding from 

 these granites. 



Abundant in many foliated rocks, as 

 in mica-schist and some varieties of 

 gneiss. 



In some foliated rocks, as gneiss and 

 mica-schist. 



As an alteration-product in many rocks, 

 as in diorite, diabase, altered sand- 

 stone, etc. 



I. In geodes and veins among older crys- 

 talline rocks, as granite, gneiss, and 

 several schists ; one variety, cordierite- 

 gneiss, contains it abundantly. 



