136 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 
| A B c D. E F 
S110) ea ee ae a tee oe eV oR EISEN ern | 64.48 | 64.52] 63.03] 61.58] 47.94] 55.08 
TF ae te ee nen tis oie CUETNY 98 tate Meee -| 19.28] 18.31] 17.72} 16.96] 18.90} 18.93 
| 1.40 -90} 2.27] 1.75] 2.21 2.02 
1.78] 2.51] 1.92] 2.85] 8.59 5.56 
1.64] 2.35] 3.63} 3.67] 8.21 5.17 
5.06; 5.11] 5.97! 6.28] 9.86 8.40 
4.41] 4.64] 3.92| 3.94] 2.81 4,23 
Ko ek ene eerteenallns 1.12] 1.25] 1.06] 1.28 39 174 
H.O ‘at WANS: os 2 sassy eBid 5 NA: uc cetesetinie Clash ajsiearale oe ieee A +24 39 
EVONIBONEHIOS. onc ocadeunnaesansenyees coceornuen } -06 \ -20 \ aah gogo 74 +29 
fase PNA od easy foo apg in Gh haces . |undet. | undet. .49 
es 22 
trace 
trace 
- 03 
trace 
: 
| 99.23 | 99.79 | 99.96 | 100.35 | 100.66 | 100.42 
The following rocks are from Shasta County, but not within either the Mount Shasta 
or the Lassen Peak areas. Collected by J. 8. Diller, who furnishes the petrographic 
data. 
A. Dacite porphyry, east fork of Clear Creek, 9 miles above French Gulch. Las- 
senose. Contains conspicuous phenocrysts of plagioclase, a few of quartz, and smaller 
ones of biotite and pyroxene, in a groundmass of quartz and feldspar. Analysis by 
J. E. Whitfield, record No. 970. P. R. C. 1418. 
B. Dacite porphyry, Smiths Gulch, 6 miles up Clear Creek from French Gulch. 
Yellowstonose. Gontains phenocrysts of plagioclase, quartz, biotite, and hornblende, 
in a groundmass chiefly of quartz and feldspar. Analysis by Whitfield, No. 971. 
Also described by J. P. Iddings in Bull. 150, p. 233. P. R. C. 90. 
C. Diorite, from Ono. Yellowstonose. Not described. Analysis by T. M. Chatard, 
record No. 1107. 
D. Metarhyolite. The country rock near the Bully Hill mine. Rich in porphyritic 
quartz. 
E. Metabasalt. Country rock, wall of ore body, Bully Hill mine. Porphyritic 
quartz absent. 
Analyses D, E, by E. T. Allen, record No. 1981. The rocks are described by Diller 
in Bull. 213. 
bs 
wo 
“ 
i] 
& 
81.25 49.85 
9.03 17.00 
- 63 4.02 
-40 5. 51 
2. 48 7.65 
trace? 1.18 
~25 4.78 
1.82 none 
1.09 2.16 
2.81 6. 65 
- 08 7 
trace 10 
+35 07 
trace none 
05 trace 
100. 24 99.94 
13 13 
100. 11 99. 81 
The sixteen following rocks, from mining districts in Shasta County, were collected 
by B. 8. Butler, who furnishes the munatelogieal data, All but six of them are tech- 
nically incomplete. 
