664. SE KROZU. 
in column A in the following table. Compared with foreign rocks, 
the rock from Oki has a close resemblance to the akerite-porphyry, 
described by Brégger;’ the augite-syenite, described by Cushing; 
the quartz-syenite, described by Pirsson;3 and the syenite, described 
by Pirsson and Washington.‘ It differs from the pulaskite from 
Fourche Mountain, described by Williams’ and by Washington® 
respectively, in having less alumina, less alkalies, and more iron 
oxides. These relationships are shown in the following table: 
| 
A B C D E F G 
SIO Sco vaste 61.83 62.60 | 63.45 65.54 | 60.75 60.25 60.03 
ALLO Fees aetne 17.08 18.07 18.31 17.82 19.68 20.40 20.76 
INOS e Gouge aco Ne 2.14 2.28 O.42 0.74 1.54 Te 7A 4.01 
Rea ean. oe 2 fit 2215 3.506 Tees 2.98 1.88 0.75 
Mic Omar ier 0.89 1.16 0.35 0.98 0.81 I.04 0.80 
CaO rian 2.24 2.27 2.93 1.92 2.20 2.00 2.62 
NGL ORs ee 4.93 5-45 5.00 SS 4.89 6.30 5-96 
TO Sere ens ter: Sosty 5-22 Be ih 5.58 5-90 6.07 5-48 
13 EO te enor TOON |OnsO 0.30 0.54 0.08 0.23 0.53 
FROa i oe Pi aie sts ee 0.24 0.10 0.00 . 
FEI Oar ree eter ha 0.30 0.07 o.1I1 0.63 0.14 
ZI Ante Bae Pasa Pera cout Bic trace Aen 
1S @ erage ara se 0.35 dee trace Bees trace 0.15 0.07 
SOs Vase tee wee ei ee Nenae eae 0.13 arene 
Min © eee See 0.12 ee none trace trace trace trace © 
BaQ sere Saas ial De 0.13 oes 
Te On eave eee eee seus nels trace 
Total eh. os 99-56 | 99.84 | 99.73 | 99.92 | 99.79 |100.47 |101.07 
* 
Loss on ignition. 
Quartz-syenite from the eastern foot of Takuhi-yama, Dozen, Oki. K. Yokoyama, analyst. 
Akerite-porphyry from Ullernas, Norway. G. Forsberg, analyst. 
Augite-syenite from Loon Lake, Franklin County, N.Y. E. W. Morley, analyst. 
Quartz-syenite from Highwood Peak, Highwood Moutntain, Mont. Pirsson and Michell, 
SG; Sali 
co 
analysts. 
Syenite from the western slope of Mt. Belknap, N.H. H.S. Washington, analyst. 
Pulaskite from Fourche Mountain, near Little Mountain, Ark. H.S. Washington, analyst. 
Pulaskite from Fourche Mountain, near Little Mountain, Ark. R. N. Brackett, analyst. 
Qh 
' Brogger, Zeitschrift fiir Krystallographie, XVI (1890), 40. 
2 Cushing, Bulletin of the Geol. Society of America, X (1899), 183. 
3 Pirsson, Bulletin No. 237, U.S. Geol. Surv., 1905, p. 63. 
4 Pirsson and Washington, American Journal of Science, XXII (1906), 446. 
5 Williams, Ann. Rep. of the Geol. Surv., Arkansas, II (1890), 70. 
6 Washington, Journal of Geology, TX (1899), 1901. 
