CLARKE.] 
IGNEOUS AND CRYSTALLINE ROCKS. 
235 
K. Wollastonite-gneiss, north fork of Mokelumne River. Mainly 
wollastonite, but garnet, quartz, and sphene are also present. P. R. 
C. 766. 
L. Melaphyr-tuff, altered basalt, west of Jackson. Contains augite 
and plagioclase, with secondary quartz, chlorite, and chrysotile. 
Originally glassy in part, but devitrified. See 14th Ann. P. R. 
C. 722. 
M. Reddish-brown mica separated from pyroxenic-gneiss, north 
fork of Mokelumne River, about 1 kilometer above mouth of Bear 
River. Described by Turner in Amor. Journ. Sci., 4th series, vol. 7, 
p. 294. Analysis by William Valentine, record No. 1736. 
Si0 2 
A1 2 3 
Fe 2 3 
FeO 
MgO 
CaO 
Na 2 
K 2 
H 2 at 110°.... 
H 2 above 110° 
TiO, 
NiO. 
MnO 
SrO . 
BaO. 
Li 2 
F ... 
C0 2 . 
Less O. 
K. 
50. 67 
6.37 
.31 
.50 
.58 
40.34 
.14 
.22 
.08 
.31 
.20 
none 
none 
trace 
none 
none 
none 
.52 
100. 24 
49.24 
14.79 
1.36 
8.00 
6.89 
10. 74 
2.76 
.88 
.20 
2.97 
.96 
.17 
.18 
trace 
.04 
trace 
90 
100. 08 
M. 
36. 62 
14.37 
4.04 
17.09 
9.68 
1.48 
.45 
8.20 
.90 
3. 26 
3.03 
none 
40 
trace 
.33 
trace 
.10 
99.95 
.04 
99.91 
