Notes on Some Rocks and Minerals — Emerson. 95 
sound on his first journey, and which I "have described in 
connection with Hall's collections.t 
I have not been able to explain how these rocks, labeled 
by some member of Dr. Hayes' party in North Greenland, 
came into the possession of Hall in Rescue harbor, but a 
comparison of them with the series recently obtained makes 
it quite certain that these specially mentioned below all 
came from Port Foulke. 
CRYSTALLINE SCHISTS AND GRANITES. 
The collection contains coarse granites in great abund- 
ance and variety, especially coarse flesh-colored micaless 
granites, large masses of pink quartz and of orfhoclase, more 
rarely fine grained gneisses, mica schists, granulytes, albite 
aplyte, hornblende schists, fissile and massive quartzytes, all 
in no wise peculiar with the exception of one and that the 
most abundant variety, which merits attention both for it- 
self and for the minerals which it contains. Several large 
pieces of the rock occur in the collection and specimens of 
the same from both sides of the bay were present in Hall's 
collection. In its commonest form the rock is a coarse red 
granite, a deep red orthoclase making up half its mass and 
large dark red garnets 1-4 cm. in diameter the other half. 
The latter are often only shells of garnet material which 
have compelled granular masses of quartz and a bronze- 
colored mica to assume the form of the trapezohedron. The 
garnets are often changed into a massive black green chlor- 
ite. Quartz and mica are rare in the mass of the rock. 
In other pieces the feldspar is gradually replaced by a 
rich, deep-blue quartz and the rock grades on the one side 
into a blue highly crystalline gneissoid granite in which at 
last the feldspar so entirely and the mica so nearly disap- 
pears — the latter remaining wholly in broad wavy films upon 
the distant foliation faces, and much decomposed into ,a 
blackish-green chloritic material — that the rock becomes a 
massive blue crystalline quartz in layers I'yi inch thick and 
of great beauty ; or on the other hand into a very even, 
medium grained mixture of cobalt blue quartz and a rich 
bronze-colored mica. The quartz contains long, straight 
fNoDRSE, Narrative of the Second Expediiion made by C. F. Hall, Washington, 
1879, Appendix. 
