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ADOLF HOEL
that was the object of the mining. There too the mica occurred in large
tables in restricted part of the dyke only. The thickness of it was about
1 meter, its direction E—W and its dip 90 Schetelig determined
the following minerals from this place: zircon, apatite, magnetite,
ilmenite, euxenite«polycrase, corundum, muscovite and oligoclase.
Pegmatitic dyke north of Skarvevand. This is a very con«
siderable dyke, 4—5 meters thick, striking NNW—SSE, dip 90°. It con«
tinues also on the south side of Skarvevand. Schetelig determined the
following minerals: nepheline, which occurred in very large rounded
crystals up to l’/s meters in diameter, tri o t i t e, plagioclase, apatite.
Adolf Hoel.
II. ROCKS AND MINERALS FROM SEILAND
Mr. Adolf Hoel has kindly entrusted me with the description of
rocks and minerals from Seiland in Finmarken, collected by him in August
1915 and later presented to the mineralog.«geological Museum of the
University of Kristiania.
A. Rocks.
As Mr. Th. Vogt, geologist to the Norwegian geological Survey,
will subsequently undertake a more detailed investigation of the geology
and the rocks of Seiland and surrounding islands, I have therefore only
subjected the rock«specimens collected by Mr. Hoel to a preliminary in«
vestigation.
According to Mr. Hoel the chief rocks on Seiland are:
1) metamorphic rocks with gneissic structure;
2) olivine«bearing plutonic rocks (peridotite) ;
3) femic hypabyssal rocks of different types, in part olivine«bearing,
genetically connected with the peridotite and intersecting it as
dykes;
4) pegmatitic rocks, intersecting the gneiss and the peridotite as
dykes; the pegmatitic dykes have afforded the minerals described
later on.
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