68 Pentti Eskola. (EXNI 
Some specimens of the sviatonossites show this reaction to 
have taken place as an alteration, in the rock already solidi- 
fied.. The products then form a pseudomorph after the pyro- 
xene with preserved outlines. The inner parts of such pseudo- 
morphs often consist of individual grains of pale green amphi- 
bole with remnants of pyroxene, while the epidote, in a dusty 
condition, has been concentrated along the borders... Where 
the alteration has happened already at the magmatic stage 
so that the hornblende, quartz and epidote have the character 
of primary constituents, there the latter have taken the 
form of poikilitic intergrowths as described above. 
The Pyrozxene-syenites. 
Among the specimens collected from! the lake-beach 
there are many with the mineral composition of the sviato- 
nossites but which are destitute of garnet. These rocks 
apparently are genetically related to the garnetiferous types: 
They are of various composition. Among those which I 
have examined microscopically, the ET types may 
be disceriminated. 
1) Porphyritic p y r ox en e-s y e n ite containing large 
individuals of microperthite. They are in all respects identi- 
cal with the porphyritic sviatonossite except in the absence 
of the andradite. | 
2) Pyroxene-hornblende-syenite, resembling 
the former, 'but containing hornblende as an independent 
constituent, not only in intergrowth with the pyroxene. 
It is a striking fact that independent crystals of hornblende 
do not occur, if andradite is present. I have formerly found 
that amphiboles and the lime-garnets exclude each other in 
the metamorphic rocks in Southwestern Finland 2), and this 
fact could be well explained from the standpoint of the 
1) P. Eskola, »Om sambandet mellan kemisk och mineralogisk samman- 
sättning i Orijärvitraktens metamorfa bergarter», Bull. Comm. Geol. Finl. 
N:o 44 (1915). 
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FREEYNIES TERS 
