DALY: GEOLOGY OF THE NORTHEAST COAST OF LABRADOR. 217 
schillerizing labradorite. (Plate 11). One may collect specimens of the 
feldspar from the numerous erratic boulders sprinkled over the hills about 
the harbor. The direction of glacial striation shows that these must 
have been carried to their present resting-places from the west and 
southwest. It was likewise made clear to us on the northward journey 
that the gabbro must be in great development in order to furnish such 
an immense amount of erratic material as we saw. Skirting the north 
shore of Paul’s Island, the “ Brave” was headed for Nain, passing 
through a long tickle walled in on either side by high cliffs of massive 
gabbro for fifteen miles before the mission station was reached. At 
the station we were still about twelve miles from a quarry where 
“precious ” labradorite in place has been opened by Mr. R. G. Taber. 
The desire to see the mineral in place decided us to risk the schooner 
among the dangerous channels of the island-labyrinth. At Nain, how- 
ever, we had the good fortune to find Dr. Wilfred Grenfell, superin- 
tendent of the Deep-sea Mission, then in command of his fine new 
steamer, the “Strathcona.” With great kindness he invited our 
party to accompany him on the steamer to Mr. Taber’s quarry; we 
thus spent one of the most enjoyable days of the summer in the 
accomplishment of what would have taken the schooner, by reason of 
the calms and baffling winds then prevailing, two or three days to 
effect. The quarry is situated on the southwest side of a small island 
called by the Eskimo, “ Napoktulagatsuk.” "It lies within one fourth 
of a mile from the mainland. 
Napoktulagatsuk is elliptical in shape and has a major axis of about 
six hundred yards. The opening has been made in a steep glaciated 
slope and covers an area of about twenty-five hundred square feet. At 
the foot of the slope a thirty-foot raised beach bears a ruined derrick, 
and a tramway which showed by their dilapidation that work has been 
discontinued for some years. While the whole island is composed of 
anorthosite, the schillerizing feldspar occurs only in the form of isolated 
patches up to fifty feet in diameter. These are generally, though not 
always, coarser in grain than the surrounding rock, and are pegmatitic 
in look. In the sunlight, the fresh surface of the rock presents a rich 
and beautiful appearance. The dominant color is the familiar blue, 
but it is associated with vivid green, bronze, orange, and red phases. 
These pocket-like schillerizing masses are clearly contemporaneous with 
their country-rock. Both types are characterized by the well-known 
composition of this gabbro. Both are cut by aplitic dikes and peg- 
matite veins. 
