The Mineral Resources of Greenland. 39 
associated with copper at Josva deposited by magmatic waters, presum- 
ably of pegmatitic affinities it is in all instances of pegmatitic origin. 
‘The northern part of Ujaratarfik Island 6 km (4 miles) east-north- 
east of Egedesminde, consists of several hornblende gneiss inclusions 
in granite gneiss, the gneissic planes of which dip 50° N.N.W. In the 
more northerly of these bands are several pegmatitic quartz and quartz- 
felspar pegmatite veins, containing a little biotite, from 15—30 cm 
(6 inches to one foot) thick. The quartz veins in part grade into and 
in part cut the pegmatite veins and, in consequence, are, in instances, 
contemporaneous with and in other cases younger than the pegmatites. 
These quartz veins over an area 45 m (150 feet) along the strike and 
1.5m (5 feet) across it, carry molybdenite and a little pyrite. The 
molybdenite occurs in plates up to 1 cm (one-half an inch) in diameter, 
the flat surface being usually oriented parallel to the extension of the 
dike. Molybdenite is particularly abundant on the borders of the veins. 
Molybdenite also occurs in fractures in the hornblende gneiss, and 
rarely as disseminated aggregates in the same rock. Microscopic examin- 
ation of a piece of the pegmatite shows it to be composed of a sodic 
plagioclase, quartz, biotite and molybdenite. The molybdenite tends 
to have its own crystal form and also occurs intergrown in parallel 
position with biotite and like it solidified before the quartz and felspar. 
The mineral occurs at some 11 other places in Greenland. 
Molybdenite occurs on the north side of Ujaragtarfik Funugdlek 
Island west of Sydproven (Southern Greenland) as a large matted 
crystalline aggregate in granite pegmatite. (CLINTON BERNARD (Private 
report) 1915). 200 m (650 feet) west is an aplitic quartz veinlet in which 
are granular bands of quartz and felspar containing fine scales of molyb- 
denite. 
Rare earth minerals. 
Two of the richest concentrations of rare earth minerals in the 
world occur, as constituents of soda-syenite pegmatites in Southern 
Greenland at Narsarsuk and on the shores of Tunugdliarfik fiord in the 
Julianehaab district. The rare earth minerals found at Narsarsuk 
include synkysite, cordylite, ankylite, lorenzenite, catapleiite, elpidite, 
eudialyte, chalkolamprite and endeiolite; those at Naujakasik: eudialyte 
and britolite; at Nunarsiuatiak: erikite, while elsewhere in the same 
region rinkite, steenstrupine and epistolite occur. Should the demand 
for the rare earths increase this is a region of considerable promise. 
Locally, the rare earth minerals are fairly abundant but the total tonnage 
is not sufficient to be the basis of a permanent industry. At various 
times considerable quantities of these minerals have been sent to Copen- 
hagen. 
