24 2 Pentti Eskola.  c (LXIH KE 
On the coast of the Tshivirkouy Bay, at least, it is frequently | 
interrupted by the porphyritic variety. For chemical study 
of the even-grained granite was selected a specimen collected 
from point 5, at the summit of the Sviatoy Noss ridge near 
Makarova. The analysis, made by the writer, gave the follow- | 
ing result. | 
| WG Re Då Norm 
SiO, | 70.88 | 11.81 | 78.01 | Quartz ..... AI a 93:34 GE SSR 
Al,O, | 14.80 | 145 | 9.57 | Orthoclasé. . .'.... 26.13 
Fe,OZz | 1.00 | 6 l Albite. - . sms är a 40:35:09 5 El sARAS 
FeO 1.08 15 | 185 | Anorthite ....... 5.00 
MnO 0.10 1 Corundum....... 0.31 C= 03 
MgO | 0.28 7 | 0.46 2 sal 95.13 ' | | 
CaO 1.33 24 | 1.58 ÖR a : 
Hypersthene P=0K30 
Na,O | 4.80 77 |... 5.08 MgSiO, 0.70 
K,O 4.42 47 | 3.10 | Magnetite ....... så MSE 
TiO, 0:39] 5 0.33 | Ilmenite ........ 0.76 Bl 
P,O; | 0.30 NES JA Pabite lyser ks 0.67... A= 0,67 SR 
HÖNS ne ER BR z fem 4.18 : 
; | . | RN 
| 99.77 | + | 99.98 |. 
Toscanose, near liparose (1, 4, 2, 3). 
The Osann figures: 
S VANN G F a (FUN Ear) FÖRR kos 
78.34" 8,18.1:1.39 7 2.50-13.5 2.0 714 621 14477 
The normative plagioclase is Aby,. The actual plagioclase — - 
is nonhomogeneous, the somewhat turbid cores having in 
sections | PM extinction angles of — 8”, corresponding to 
the composition Absg, while the marginal. portions show 
extinction angles up to — 12” which indicates the compo- 
sition Aby,. The other minerals are cross-hatched microcline, 
quartz, rather pale brown biotite, muscovite, magnetite and 
