The island Stokkøya, especially in the southern part, is rich in a large number of nepheline-syenite pegmatites, some of them hosted in basaltic rocks.
References
- Breithaupt, A. (1858): Regelmäßige Vervachsung des Tetartins nach und mit Mikroklin. Berg-und Huettenmænnische Zeitung, 17: 324-325 [note on albite and microcline from Stokkøya]
- Flink, G. (1899): Über einige seltene Mineralien aus der Gegend von Langesund in Norwegen. Bulletin of the Geological Institution of the University of Uppsala 4, 16-27
- Paijkull, S. R. (1876): Homilit, ett mineral från Brevig i Norge, Geologiska Föreningens i Stockholm Förhandlingar 3, 229-232
- Brøgger, W.C. (1890): Die Mineralien der Syenitpegmatitgänge der südnorwegischen Augit-und Nephelinsyenite. Zeitschrift für Kristallographie und Mineral.16. 663 pp
- Neumann, H. & Bergstøl, S. (1964): Contribution to the Mineralogy of Norway No 25. Pyrophanite in the southern Part of the Oslo Area. Norsk Geologisk Tidsskrift 44: 39-42 [analysis on pyrophanite from Stokkøya]
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