One of the major areas for larvikite quarries in Tvedalen, and in the central Tvedalen area. The first quarry on this hill was Svensken, but then during the years more quarries have been opened and older ones have changed names, often making an exact locality determination of this quarry complex pretty difficult. At the moment the names of the quarries in this complex is A/S Granit and Tuften.
Larvikite is an alkali syenite rich in labradorescent feldspar, used as facing stone.
The alleged new minerals UK-7 and UK-10 have been found in Tuften quarry.
References:- Larsen, A. O. (1981): Kloritt (chamositt) fra Tvedalen. NAGS-Nytt 8 (3), 8
- Engvoldsen, T., Andersen, F., Berge, S. A. & Burvald, I. (1991): Pegmatittmineraler fra Larvik ringkompleks. STEIN 18 (1),15-71
- Haugen, A. & Ellingsen, H. V. (1991): Hvordan man finner et nytt mineral. STEIN 18 (3), 28-29. [on the found of hingganite-(Y)]
- Åsheim, A. (1994): Hamberg(itt). STEIN 21 (2), 117-119
- Andersen, F., Berge, S. A. & Burvald, I. (1996): Die Mineralien des Langesundsfjords und des umgebenden Larvikit-Gebietes, Oslo-Region, Norwegen. Mineralien-Welt 7(4), 21-100
- Nordrum, F. S. (1999): Nyfunn av mineraler i Norge 1998-1999. Bergverksmuseets Skrift 15: 87-90
- Nordrum, F. S. (2000): Nyfunn av mineraler i Norge 1999-2000. Bergverksmuseets Skrift 17: 59-63
- Nordrum, F. S. (2004): Nyfunn av mineraler i Norge 2003-2004. STEIN 31 (2), 36-44
- Raade, G., Grice, J.D., Cooper, M.A. (2009): Alflarsenite, a new beryllium-silicate zeolite from a syenitic pegmatite in the Larvik plutonic complex, Oslo Region, Norway. European Journal of Mineralogy, 21, 893-900.
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http://home.c2i.net/aolarsen/Pegmatites.htm
113 entries listed. 65 valid minerals. 1 type locality (valid mineral).
