The Mineral Resources of Greenland. 51 
containing much finely divided graphite. Bands of the most highly 
graphitic material, of which there are 3 or 4 on the small peninsula, 
are, as a rule but 0.3—0.6 m (rarely 1.25 m) (1 to 2 (rarely 4) feet) wide. 
Microscopic study of one of the better samples shows the rock to be 
an opaque aggregate of fine-grained graphite (probably 90 percent) and 
a little quartz, pyrite and sericite. Graphitic beds similar in character, 
but slightly poorer, occur on the neighboring (northeast) part of Arsuk 
Island and, according to Amos D. Лонмзом, on Ivsuamint island 13 km 
(8 miles) northeast of Egedesminde. 
The original rock of these localities was a carbonaceous mud, which 
later, by orogenic movements, was metamorphosed into a schist. Although 
the graphite is in reality probably finely crystalline, in the trade the 
Garbonaceous File 
0’ 100" 
Shale . Conglomerate . 
=] Sandstone . Feridotite . 
Fig. 23. Sea-cliff at Colonial Coal Mine Kaersuarsuk showing metamorphism of coal 
and carbonaceous shale to graphite. 
graphite would be classed as “amorphous”. The grain of the rock is 
too fine to permit separation of a clean graphite product. 
Amorphous graphite and graphitic shale, contact metamor- 
phosed coal and carbonaceous shale. 
On the north shore of Nugsuak Peninsula peridotite dikes and 
sheets of early Tertiary(?) age are intrusive in Cretaceous sedimentary 
rocks. Where these rocks traverse coal or carbonaceous shale the carbon- 
aceous matter has been either partially coked or metamorphosed to 
amorphous graphite or graphitic schist. Rink appears to be the first 
to have correctly recognized the origin of this graphite. Several such 
localities were examined at Kaersut and Kaersuarsuk, and a similar 
deposit is known to occur at Niarkornat. Doubtless others exist in 
the region. | 
At Kaersuarsuk the Cretaceous sedimentary rock consists of 
lenticular beds of sandstone and carbonaceous shale and a seam of coal. 
140 m (450 feet) west of the colonial coal mine is a vertical dike of 
peridotite, (See Fig. 23) which, for a lateral distance of 4.5 m (fifteen 
4* 
