lenses separated by a framework of lujavrite-veins. The veins 
increase downwards in number and thickness, and thus the 
breccia-zone passes into the more uniform lujavrite-body. In 
some places, however, a gradual transition from naujaite to 
lujavrite is observed. 
The lujavrites are dark-coloured and rather fine-grained 
rocks showing a thin platy parting and a corresponding fissility 
parallel to the thick platy parting of the superincumbent nau- 
jaite and parallel, too, to the upper surface of the lujavrite- 
body. Since the latter surface is not quite horizontal but on 
a large scale cup-shaped, the lujavrites are exposed in a 
tolerably circular zone which surrounds the naujaite area and 
reaches its maximum width, about two kilometers, in the south- 
eastern part of the complex. It is probable that the general 
form of the lujavrite-mass is similar to that of the naujaite, 
but no substratum is exposed to view and it is, therefore, not 
possible to indicate the actual thickness of the lujavrite-body. 
In the southeastern part of the batholite, between Laxe-Elv 
and Agpat, the visible thickness, measured perpendicularly to 
the direction of the parting, exceeds 600 meters. Roughly 
estimated, the volume of that part of the lujavrite-body which 
is above sea-level is about equal to the total volume of the 
naujaite and the sodalite-foyaite taken together, and as the 
lujavrites no doubt extend far below the sea-level they are, 
quantitatively, the most important rocks of the batholite. 
The lujavrites occur in two varieties; the green egirine- 
lujavrite and the black arfvedsonite-lujavrite. Transitional forms 
are also found, though they are not common. Оп the whole 
both varieties are present in about equal amounts, but their 
mutual distribution is rather irregular. The veins in the lower- 
most portion of the naujaite as a rule consist of arfvedsonite- 
lujavrite. Some veins have been found, however, the marginal 
zones of which are of the arfvedsonite variety while the interior 
is egirine-lujavrite. As to the main body of the lujavrite the 
