44 . Pentti Eskola. (LXHI 
grained and indistinctly porphyritic or aplitic, this variety 
often forming dikes or schliers. Pegmatitic dikes contain 
bluish quartz. 
At points 64 Bk and 64 B1 the rock is even-grained 
and contains andradite only in the form of minute grains. 
In the shore-drift north of point 47 A the syenitic rocks 
are still much more variable, and as the wave-worn boulders 
are fairly fresh, a great number of specimens were collected 
from the beach which indeed presents a fine pattern-card of 
rocks from the Sviatoy Noss mountain. It may be of some 
interest to quote my field notes concerning the different 
varieties of the syenites. The following types were dis- 
ceriminated: a 
1) Porphyritic syenite with garnet. The phenocrysts are 
white Karlsbad twins of alkalifeldspar attaining a size of 
3 Xx 1.5 cm. The granular ground-mass is fine-grained and 
contains much green pyroxene (over 50 percent) and a 
little garnet besides feldspar. This very peculiar rock is 
likely to call a petrographer's attention even at some 
distänce. 
2) Like 1), but the phenocrysts are smaller (1 Xx 1.5 cm) 
and the ground-mass coarser, being medium-grained and 
containing euhedral- crystals of pyroxene and andradite. 
The latter have the simple dodecahedron form. 
3) As 2), but no difference between the phenocrysts and 
the ground-mass individuals is noticeable. The rock is even- 
grained and medium-grained. 
4) As 3), but the andradite-crystals play the röle of 
phenocrysts attaining a size of I cm in diameter. Smaller 
crystals of pyroxene are enclosed in the andradite and are 
idiomorphic towards the latter. The amount of the pyroxene 
varies and there are examples destitute of this mineral. 
This is type 
5) with dodecahedra of garnet in a granular feldspar 
mass. 
6) The opposite case to 5, syenite without garnet, but 
with some quantity of green pyroxene. This mineral compo- 
sition was often found in porphyritic examples. 
