n SV 
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Å N:o 1) Igneous Rocks of Sviatoy Noss in Transbaikalia. 9 
remnants of older rocks which are so characteristic of the 
anatectic granites in Finland, are only found on a limited 
scale on Sviatoy Noss. 
Crystalline limestone forms -a considerable 
part of the metamorphic rocks of Sviatoy Noss. As a rule, 
it occurs in the form of lenticular masses of all sizes, the 
largest being some hundred meters in thickness. The longest 
diameter of the masses usually is only a few times greater 
Fig. 4. Amphibolitic adergneiss. N. end of Sviatoy Noss. 
Photo M. Sojusoff. 
than the shortest one. In part the marble consists of very 
pure calcite having, however, almost always graphite in the 
form of thin scales as a minor constituent. Sometimes the 
-limestone contains considerable amounts of diopside or 
tremolite, the former occurring at places, e. g. on the west 
— shore near the North Cape, as euhedral though uralitized 
crystals of many centimeters in lenght. The limestone is 
— coarsely-crystalline (centimeter-grained). At places also fine- 
 grained varieties occur, but these are probably always 
förvlonttic and have formerly been coarsely crystalline. 
Like all the other metamorphic rocks, the limestone is 
| frequently cut by dikes of pegmatite, aplite and lamprophyres. 
