An abandoned feldspar quarry.
References:
in cronological order:
- Raade, G. (1997a): (Nb,Fe)-substituted anatase from Herrebøkasa, Østfold, Norway. Bergverksmuseets Skrift 12: 14-15
- Raade, G. (1997b): (Nb,Fe)-substituted anatase from Herrebøkasa, Østfold, Norway. STEIN 24 (3), 122-123
- Witsø, T. (1999): Eit mineral blir funne. Rynersonitt. STEIN 26 (4), 50-51
- Kristiansen, R. (2000): Mer om rynersonitt. STEIN 27 (1), 12-14
- Sørlie, T (2003): Herrebøkasa - juvelen blant Østfolds pegmatitter. Norsk Bergverksmuseum, Skrift 25, 19-22.
- Larsen, S. (2005): Herrebøkasa- Haldens store skattkammer. STEIN 32 (4), 24-26
- Kristiansen, R. (2006): Mineralnytt. Nytt for Norge: Liandratitt, U 6+(Nb,Ta)2O8 fra Herrebøkasa, Østfold. STEIN 33 (3): 28
- Kristiansen, R. (2008): Nye mineralfunn i Norge. STEIN 35 (1): 17-21 [on the find of triplite and rynersonite]
Mineral List:38 entries listed. 34 valid minerals.
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