204 



AU the localities mentioned are situated in the district of the 

 nepheUte- syenite and here the steenstrupite is found partly in 

 pegmatitic veins and partly embedded in grained albite. 



Crystalline form. Though a number of the new forms of 

 steenstrupite possess bright and shining faces, they are how- 

 ever not especially adapted for angle measurements. The 

 rhombohedral faces are as a rule horizontally striated so that 

 they give a whole series of signals and the base is always 

 more or less uneven or partly facetted. Therefore the values 

 found for the angles may vary several degrees. However part 

 of them have been sufficiently regular to make it possible to 

 state, that all the formations had the same axial ratio, as Mo- 

 berg found it to be, viz: 



Axis с = 1-0842; (OOOl) : (iOTl) = 51° 23'. 



No other faces were found on any of the crystals than 

 those mentioned by Mob erg; on the other hand the relative 

 size , in which the different rhombohedra stand to each other, 

 have led to the estabhshment of the following 3 types: 



Type I represents the formerly known formation of steen- 

 strupite of which a drawing by M ob erg is here reproduced. 



Fig. 5. Steenstrupite, type 1. 



