IGNEOUS AND CRYSTALLINE ROCKS. 1738 
Ka! 
Hi! 
O at 110° 
2. SNOQUALMIE QUADRANGLE. 
Rocks described by Smith and Calkinsin Folio 139. Analyses by G. Steiger, record 
No. 2145. 
A. Rhyolite, near Easton. Liparose. Contains albite, quartz, magnetite, zircon, 
and apatite, with a little secondary kaolin, sericite, and limonite. 
B. Hypersthene andesite, Naches Valley. Tonalose. Contains plagioclase, 
hypersthene, augite, magnetite, and apatite. 
C. Granodiorite, head of Gold Creek. Tonalose. Contains plagioclase, orthoclase, 
quartz, hornblende, biotite, apatite, zircon, magnetite, and titanite. 
D. Basalt, 2 miles south-southeast of Naches Pass. Auvergnose. Contains plagio- 
clase, olivine, augite, magnetite, apatite, and very little glass. 
A B Cc, D 
IO oica:e ain dada dimcse ee camienredens buses oMobeaiscues wonutndeme cae mmiunaaceray 60. 49 50. 36 
AbkOz 17.77 15. 83 
Fe,03 1.98 2.29 
FeO.. 3.29 8.11 
MgO. 2.94 7.90 
CaO... 6. 20 9. 25 
Na,O. 3. 67 3.05 
K20...... 1.37 - 86 
HaO at 105°. .... .27 -05 
H20 above 105°. 1.13 +27 
MOB csieicrsisiwess - 69 1.33 
ZrOv. . HOD hess hessimssis 
P03... - 08 -21 
MnO. 09 = 24 
BaO.. 04 trace 
SrO... 02 trace 
(CONT) Oi. crsatrose cae mtderiine aaiiedioasavtescirisie leejonere aise arin aye sinieeciney aetna trace none 
100. 05 99. 75 
COz2, S, and SOx absent. 
