IGNEOUS AND CRYSTALLINE ROCKS. 101 
G. Trachytic phonolite, dike on west slope of Bull Cliff. (The latite-phonolite of 
Graton.) Miaskose. Contains alkali feldspars, nepheline, nosite, sodalite, augite, 
scanty egirine, brown hornblende, magnetite, sphene, apatite, and sometimes laven- 
ite. P.R.C. 624. 
H. Altered phonolite, Washington shaft, Victor. Contains potash feldspars, with 
some alteration to muscovite. Crystals of pyrite and fluorite are visible, but nepheline 
and egirine have disappeared. P. R. C. 623. 
I. Nephelinesyenite, near the Longfellow mine. Akerose. Containsalkalifeldspars, 
nepheline, sodalite, augite, some egirine, hornblende, biotite, sphene, apatite, and 
magnetite. Sp. gr., 2.68, 23°. P. R. C. 626. 
J. Nepheline basalt, Appie Ellen shaft. Much altered. Rich in olivine, augite, 
and magnetite. Also contains nepheline, feldspars in small amount, and biotite. 
Sp. gr., 2.99, 23°. 
K. Altered nepheline basalt, Anna Lee mine. 
L. Local facies of a phonolitic mass, Bull Cliff. Akerose. Contains abundant 
augite, plagioclase, alkali feldspar, magnetite, and a little red-brown biotite, with a 
colorless isotropic base in the darker spots. P. R. C. 627. 
G H ig J. K L 
35.03 | 48. 61 49. 84 
9.80 | 20.74 17.78 
5.55 4,29 5. 86 
4.98 = 22 2. 62 
9.78 2.11 3. 02 
15.09 +25 7.35 
2. 04 -16 5.20 
2.16 aad 3.04 
-41 | 12.10 ~34 
2.05 7.07 2. 02 
2. 20 3.57 1.48 
1.99 +29 -76 
none |........ - 03 
15619—Bull. 419—10 —8 
