Famous for cordierite and sunstone specimens. Especially known is sunstone (aventurine feldspar) from the classical, now abandoned Østerådalen locality, (often labelled just "Tvedestrand"). This sunstone is by some considered to be the best in the world.
References
- Weibye, P. C. (1848): Beiträge zur topograpischen Mineralogie Norwegens. Archiv für Mineralogie, Geognosie, Bergbau und Hüttenkunde. 22: 465-544
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