BQ Sypney H. Batt: 
sometimes mica. Prochlorite and sodalite are also present. Some- 
what similar soda-rich rocks occur to the east of Julianehaab, where 
they are intrusive in sandstone of supposedly Devonian age. In con- 
sequence, this foyaite may be post-Devonian and possibly younger than 
some of the diabase dikes. 
The open cut is some 150 m (500 feet) long and extends from N.E. 
to S.W. (Fig. 8). The northeast end is only about 18 m (60 feet) wide, 
[æ] Chalcopyrite. EH Slende. (ll Celera . 
Rees J/derite . С] Cryolite . Quartz . 
Natural Size. 
Figure 9. Showing relations of various constituents of cryolite ore. 
but the south end, where the pit is about 45 m (147 feet) deep is over 
49 m (160 feet) wide. The mass becomes larger with depth, as the 
northeast granite wall alone dips inward at an angle of some 60°. The 
southeast wall dips southeast 45°, the south wall south 45°, and the 
northwest wall northwest 85°. On the northwest side an arm of eryolite 
extends out under the fiord and, except at one place where granite 
is exposed, this side of the pit ıs all eryolite. At present, however, 
buildings and fill between the open cut and the fiord obscure the shape 
of this branch body. The bottom of the pit is some 45 m (150 feet) 
below sea level. The depth to which the eryolite extends is unknown, 
but diamond drill holes have proved the deposit to a depth of some 
95 m (312 feet). In addition, large reserves exist above the present 
bottom of the open cut. 
The eryolite body consists of massive white and “black” (or better 
dark brownish-gray translucent) eryolite. Crystals are exceedingly rare 
