tory of ilvaite itself are mostly separated from the water by a 

 gravelly and sandy plain. 



The way in which the ilvaite occurs in the syenite, is only 

 a little different from its common way of occurrence in the 

 sodalite-syenite. As far as can be distinguished, it is found in 

 small transformed veins of pegmatite, chiefly consisting of red 

 microcline-micropertite and grained ilvaite; in cavities crystals 

 of ilvaite, albite, and green garnet 

 are found. The material is very 

 scarce, and the crystals rather 

 small (1 — 3 mm.). 



The form is not especially 

 characteristic , and besides the 

 crystals are always incompletely 

 developed, so that generally only 

 a smaller part of each crystal is 

 provided with faces. The separate 

 crystals, however, do not deviate 

 much from each other. 



Combination : 6 {ü 1 0}, s { 1 20} , 

 Л{210}, iv[^Ol}, P{lOl}, c{00l}, 

 w{012}, e{02l}, /"{041}, ojlll}, 

 г{121}. 



The faces are generally very bright, sometimes well deve- 

 loped, but must frequently rather curved and striated. 



Fig. t8. Ilvaite, type XVI. 



General remarks concerning the forms of the crystals. 



Although the separate types of ilvaite from Siorarsuit deviate 

 rather much from each other, certain common features may be 

 found characterizing the occurrence as distinct from all other 

 occurrences. The ilvaite from Kangerdluarsuk resembles in 

 most respects rather closely that treated of here. 



