Hella 1 Feldspar Quarry, Helle, Arendal, Aust-Agder, Norway

Pegmatite-dike, 10-15 m thick, near Arendal, located on the western shore of Neskilen, about 200 m south of the Helle farm. Quarry operation started around 1860. Already abandoned in 1930s

Ref.:
- Forbes, D. & Dahll, T.(1855): Mineralogiske Iagttagelser omkring Arendal og Kragerö. Nyt Magazin for Naturvidenskaberne, 8, 213-229 + 2 plates (in norwegian)
- Andersen, O. (1931): Feltspat II. Forekomster i fylkene Buskerud og Telemark, i flere herreder i Aust-Agder og i Hidra i Vest-Agder. Norges Geologiske Undersøkelse 128b,1-109 [p.76]