IGNEOUS AND CRYSTALLINE ROCKS. 37 
E. Epidote-chlorite schist, one-fourth mile northeast of Montezuma, Mitchell 
County. Contains epidote and feldspar, with less chlorite, hornblende, and magne- 
tite. 
F. Metamorphosed amygdaloid, 3 miles southeast of Boone, Watauga County. 
Contains orthoclase and plagioclase, with less sericite, chlorite, and magnetite. 
G. Pyroxenite, var. websterite, from Webster. Websterose. Described by Wil- 
liams, Am, Geologist, vol. 6, p. 35. Consists of diopside and bronzite. Analysis by 
E. A. Schneider, record No. 1096. Material dried at 105°. P. RB. C. 388. 
H. Spherulitic rhyolite, Sam Christian gold mine, Montgomery County. Alaskose. 
Described by Diller, Am. Jour. Sci., 4th ser., vol. 7, p. 337. The rock of the supposed 
fossil Palxotrochis. Contains feldspar and quartz, with a little biotite and sericite. 
Analysis by Hillebrand, record No. 1796. 
E F G. A 
SiOs. 47.85 | 43.62 | 55.14 79. 57 
AlsO3 16.51 | 17.30 -6 11.41 
Fe203. 4.16 | 14.18 3. 48 20 
PQ viisccoesessesonsis 7.43 6. 83 4.73 70 
I eae A snr isp ou Tpeieadn eae eidlaneaionsar SOE SARA IRAS 6. 24 2.34 | 26.66 | a little 
ce esate ain labs canine et ct nolare oe 7.00 1.63 8.39 ae. 
DS OGY coos: a ireaceiase nunorannars engender sia iow aala atwnNntel each aecatea eee 3. 20 3. 45 -30 3. 46 
HOG ccs scas - 82 8608. | oc siesces . 
Ti20 at 110°. . : 5 0, 
100.41 | 99.74 | 100.36 | 100.02 
The following rocks from Corundum Hill were collected, analyzed, and described 
by T. M. Chatard, Bull. 42, p. 45. 
I, Altered gneiss. Made up of micaceous scales, with grains of quartz and some 
earthy matter. Record No. 238. 
J. Dunite. Dunose. Olivine rock containing a little chromite. Record No. 256. 
K, L. Yellow, claylike alterations of dunite. Record Nos. 254, 255. 
Other analyses of altered rocks are given in the paper, and also analyses of associated 
minerals. 
15619—Bull. 419—10—4 
