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ADOLF HOEL
extention as erratic boulders of limestone are often found in a narrow valley
between the two glaciers mentioned below.
The central parts of Seiland are composed of igneous rocks younger than
the surrounding gneisses and schists. These rocks are gabbro and diorite
and they form the highest mountains of Seiland, reaching up to 1000
meters and covered by 2 glaciers shaped like a shield, the Nordmands«
fjordjøkelen and the Seilandjøkelen.
The occurence of rocks containing nepheline in Seiland has long been
presumed. In his above mentioned paper Th. Scheerer writes the
following on this subject1:
«During my visit to Freiburg last year I had an opportunity of seeing
some minerals, collected by Assessor Ihle and Geschworner Netto some years
ago on the southern coast of Seiland at the Rognsund. It appears from these
minerals, that there occurs on Seiland a syenite, which ressembles the zircon«
bearing syenite of southern Norway not only in its exterior, but in which we
also find the two most caracteristic minerals of the latter, viz. zircon and
nepheline. There occurs also black mica and magnetite . . . .»
In 1873 K. Pettersen made careful researches in Seiland in order
to find the nepheline«bearing syenite, but he did not succeed. He only
found along the southern shore of the island several dykes containing
greyish or reddish feldspar together with black mica and magnetite2. But
in 1874 at the shore of Komagfjord in Sørøen he discovered a big erratic
boulder, composed of greyish feldspar as the chief constituent, together
with black and white mica, magnetite and nepheline.
My visit to Seiland. This was the state of the question as to the
occurrence of nepheline«bearing rocks in Seiland when I happened to visit
it last year on my way to Spitsbergen. I had to wait several weeks in
Tromsø on account of the bad conditions of ice in the Arctic sea, and I
there met a Danish gentlemen, Mr. Schnor, who had mica«quarries in
Seiland. He told me that he had found cryolite on the island and showed
me a beautifull crystal of feldspar found there. He asked me if I
would go there and examine his quarries. As there was no sign of any
bettering of the ice«conditions I consented, and started for Seiland on the
19. of August. At Hammerfest my friend the headmaster, G. Watnelie
joined me. We arrived at Oldervik at noon on the 21st. The same after«
noon we found several kinds of nepheline«bearing dykes and collected
1 Th. Scheerer, 1. c., pag. 315.
2 K. Pettersen, Om forekomst av Elæolith i Vestfinmarken, 1. c.
112
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