IGNEOUS AND CRYSTALLINE ROCKS. 159 
M. Quartz-mica diorite, Chowchilla River. Tonalose. See 17th Ann., pt. I, p. 
691. Contains plagioclase, quartz, a little orthoclase (?), brown mica, hornblende, 
rather abundant apatite, a little iron ore; one zircon-like crystal was noted. 
Analysis by W. F. Hillebrand, record No. 1461. P. R. ©. 745. 
N. Quartz-mica diorite, Yaqui Creek. Tonalose. For the Educational Series of 
Rocks. Contains plagioclase, quartz, biotite, hornblende, a little pyroxene, iron 
ore and apatite. Analysis by George Steiger, record No. 1643. Described by Turner 
in Bull. 150, p. 339. 
O. Diabase, dike 14 miles northeast of Hornitos. Auvergnose. See 17th Ann., 
pt.1, p. 694. Contains plagioclase, partly labradorite, augite, brown hornblende, and 
iron ore. Analysis by Hillebrand, No. 1461. P.R.C. 750. 
P. Igneous rock, near Cathay Hill. Rossweinose. See 17th Ann., pt. 1, p. 694. 
Contains two minerals unidentified; neither is olivine. Analysis by Hillebrand, No. 
1461. P.R. C. 749. 
H20 at 110°..... 
. ters ae . 29 - 06 +05 
HsO above 110% o:- se. aqay sx train caGak Se Ra PSE RAGES ot BeegeRea seeee iE 92 1.45 +95 2.06 
iO 8 =H 55 -95 1.23 37 
Q. Feldspathic mica schist, Chowchilla River. See 17th Ann., pt. 1, p. 691. 
Contains quartz, feldspar, biotite, muscovite, apatite, and specular iron. Analysis 
by W. F. Hillebrand, record No. 1461. P. R. C. 744. 
R. Andalusite hornfels, Yaqui Gulch. Principally quartz, andalusite, brown and 
white mica, black graphite-like grains, a little iron ore, and probably feldspar. Analy- 
sis by George Steiger, record No. 1643. Described by Turner in Bull. 150, p. 342. 
S. Andalusite schist, Chowchilla River. See 17th Ann., pt. 1, p. 691. Contains 
quartz, biotite, andalusite, sericite, a little muscovite, probably graphite, iron ore, 
a few garnets, and apparently chlorite. Analysis by Hillebrand, No. 1461. P.R.O. 
743. 
T. Chiastolite schist, Yaqui Gulch. Contains chiastolite, sillimanite, brown mica, 
sericite (?), probably graphite, and clear grains which appear to be quartz and feldspar, 
Analysis by Steiger, No. 1643. Described by Turner in Bull. 150, p. 342. P.R.C.135. 
U. Hornfels, Agua Fria Creek. See 17th Ann., pt. 1, p. 691. Contains quartz, 
brown mica, iron ore, and plagioclase. Analysis by Hillebrand, No. 1461. P. R.C. 
747, 
