(Bånkall bruddet (Kristiansen bruddet))
Old nordmarkite quarry (nordmarkite = quartz-bearing alkali feldspar syenite).
References:
- Neumann, H. (1950): A new Find of Helvite in the Oslo area. Norsk Geologisk Tidsskrift 28, 234
- Oftedal, I. & Sæbø, P.Chr. (1965): Contributions to the mineralogy of Norway. No 30. Minerals from Nordmarkite Druses. Norsk Geologisk Tidsskrift 45, 171-175
- Kvamsdal, L.O. (1998): Mineralene fra Nordmarkitt og Grefsensyenitt i Oslofeltet. AS Merkur-Trykk, Oslo. 72p
- Kvamsdal, L.O. (2001): En godbit fra Kristiansenbruddet. STEIN 28 (19): 10 [on the find of a large helvite]
- Husdal, T. (2009): Ancylittmineraler i Norge. Norsk Bergverksmuseum, skrift 41, 33 - 42 [with an analysis of a calcioancylite-(Ce)]
Mineral List:46 entries listed. 33 valid minerals. 2 erroneous literature entries.
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