403 
IGNEOUS ROCKS OF THE STERRA NEVADA. 
NAGS SOE PR E-ibhRIVARY IGNEOUS ROCKS, 
Porpuyr- | Auci1ic|} MExa- | Peripo- Quartz-Mica-Diorires HEr.-MIcA ees DIORITE 
ITE. TuFF. | PHYRE? | TITE. IDRUNINS IR (GRANODIORITES). POvEUERS GRANODI- APLITES. (?) 
SPECIMEN ee ORITE. 
NUMBER. 
F 25 19 26 325. 446 71 303 369 304 39 413 161 250 
; S.N. S.N. S.N. S.N. S.N. S.N. S.N. S.N. So INI SaeN S.N. SwNe Butte. 
SiO, - - 68.58 54.66 | 49.24 | 44.81 51.32 67.33 | 68.65 | 62.62 66.65 66.28 | 74.21 | 76.03 57.87 
TiO, - - - 57 67 .96 |) 1.88 1.23 36 28 55 BF 54 30 .07 53 
Al,O, - - 13.04 15.85 | 14.79 |$ °° 15.28 15.93 | 16.34 | 17.51 17.601 16.03 | 14.47 | 13.39 16.30 
Cr,O, - - : a os a .20 hs ae is =: at a < i ae 
Wet, - 2 - .26 1.82 1.52 1.98 47 1.90 93 49 .93 1.80 35 48 1.71 
FeO - - - 3.40 5.12 8.00 4.52 8.59 1.59 1.48 4.06 1.67 1.88 .50 oBil 3.86 
MnO - - 15 .18 18 5 Bt .09 .08 .05 .07 .05 | none | trace .08 
NiO - - - Be ae Bi .09 .16 5 si ie g ae a ne 3H 
CaO - - B22 8.75 | 10.74 6.58 11.58 4.09 3.07 5-49 3.75 1.71 1.28 5-53 
SrO- - - = Pee trace | trace | none Mental trace .07 trace aaa trace trace | trace trace 
race trace 
BaO - - .10 .04 .04 | none none .08 .09 | trace a2) .o8 | none .04 05 
MgO - - - 1.01 5.64 6.89 | 30.91 125 1.63 1.29 2.84 1.26 1.12 28 105 5.50 
K,O - - 1.90 *47 88 ; .22 2.46 1.85 1.76 1.70 3.49 .10 5.18 75 
Na,O - - - 4.94 3.46 2.76 15 2.92 2710p | A285 3.49 4.59 4.10 7.62 2.98 5.01 
On - none none trace : ae trace | trace | trace trace trace trace | none trace 
H,0O below 110° C. 16 125 .20> 15 .06 .19 .24 EDD) .03 II ales 15 .26 
H,O above 110° C. 1.00 2.48 2.07 6.88 95 .66 .62 92 41 39 522) 34 2.40 
P.O; - - - .20 15 .E7 .02 25 II 15 .12 18 30 .07 .03 Ay 
COF - - 1.31 39 .9O 1.79 , : : ; ; Oo if : Nfs 
FeS, - - - 15 .09 : ae a ; : ae : : é ‘ 
99.99 | 100.02 | 100.08 | 100.18 | 100.28 | 100.18] 99.99 | 100.12] 99.99 99.92 | 99.99 | 100.33] 100.12 
