36o 
The American Geologist. 
June, 1905 
granite. The contact with the granite is well marked on 
the east, north, and west; on the south it is covered by 
the loose gravels of the valley. A number of pegmatyte 
veins cut through the noryte, dipping rather uniformly S. 
45°— 50° W. at an average angle of about 30° with the hori- 
zontal. These veins have a very uniform structure, like 
that shown in fig. 3. There is a distinct contact between 
P/q5. DvKe Structure. 
/ CoaK'sePegmat/te 
2.Graph;c Groimfe. 
s.TaybtreoiK" 
^. Gaf net quartz ite. 
J. Home .^ 
the noryte (5). and upper portion of the vein. This upper 
portion (i) consists of a coarsely crystalline pegmatyte rich 
in mica and black tourmaline. This grades into a fine 
grained graphic granite (2) in which is often a little mica. 
Plate xxii, fig. i. is of a hand specimen of this rock. The 
graphic granite grades downward into the "pay-streak" (3) 
in which the rarer minerals are found. Fig. 2, plate xxii. 
shows a piece of this part of the vein, containing lepidolite, 
albite and muscovite. Pockets occur in this layer, lined 
with crystallized quartz and feldspars and containing crys- 
tals of tourmaline, kunzite and orthoclase, usually embed- 
ded in a clayey matrix. Between the paystreak and lower 
portion (4) of the vein the contact is sharp. This lower 
part consists of a banded garnet quartzyte. making a dis- 
tinct contact with the noryte. A peculiarity of this is that 
it always composes one-half the thickness of the vein and 
that the minute garnets have a banded arrangement, often 
