172 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 
WASHINGTON. 
1. MOUNT STUART QUADRANGLE. 
Rocks described by George Otis Smith, in Folio 106. Analyses A, B, C, F, and G 
by H. N. Stokes, record No. 1836; D, E, H, and I by W. F. Hillebrand, record No. 
1831; J by George Steiger, record No. 2046. 
A. Granodiorite, south slope of Mount Stuart. Tonalose. Contains plagioclase, 
orthoclase, hornblende, biotite, quartz, and magnetite. P.R. C. 1407. 
B. Granodiorite, ridge between Hardscrabble and Cascade creeks. Tonalose. 
Contains plagioclase, orthoclase, biotite, hornblende, quartz, magnetite, and apatite. 
P.R.C. 1412. 
©. Granodiorite porphyry, dike 2 miles west of Mount Stuart. Tonalose. Contains 
plagioclase, biotite, hornblende, orthoclase, and quartz. P. R. C. 1414. 
D. Serpentine, Three Brothers. Derived from saxonite. Contains serpentine, 
bastite, magnetite, and pyrite. P. R. C. 1408. 
E. Metamorphic rock, head of Beverly Creek. ‘‘Nickel Ledge.’’ Believed to be 
derived from an inclusion of limestone in the peridotite. P. R. C. 1410. 
A B C. D E 
64.04} 63.37] 63.78] 39.00] 32.12 
15.58 | 15.90) 16.39| 1.75 “82 
1.26] 141) 1:12] 516] 205 
3.22) 3.18] 276] 1.71) 3.50 
3.23} 3.33] 3.97] 3800] 26.73 
$51) 463] 4.07} trace | “1.81 
| 4. 84 
Eee ee APOE aoe Fees eo egoeen at hece een eee 2.22} 2:10] 2.03 10 } 06 
Ka oe 
O38 TOP occce icra Sh Sees Sean careers aes Sea cece sins ats 
2 Actual condition of sulphur not known. 
F. Gabbro, east of Beverly Creek. Hessose. Contains diallage and ‘basic” 
plagioclase, with pyrite and serpentine as alteration products. P. R. C. 1411. 
G. Gabbro,CamasLand. Hessose. Containsaugite, olivine, plagioclase, magnetite, 
and apatite. P.R.C. 1413. 
H. Diabase, dike on ridge west of Turnpike Creek. Tonalose. Contains plagioclase, 
augite, olivine, magnetite, and apatite. P. R. C. 1406. 
I. Basalt, middle fork of Teanaway River. Vaalose. Contains augite, plagioclase, 
magnetite, and apatite, with a glassy base. P. R. C. 1409 
J. Yakima basalt, Clealum Ridge. Andose. Contains plagioclase, augite, olivine, 
magnetite, apatite, and glass. P. R. C. 1405. 
