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Plagioclase Quarry (Sunstone quarry), Midtre Havredal, Havredal (Hafredal), Bamble (Bamle), Telemark, Norway

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Name(s) in local language(s): Feltspatt brudd (Solsteins bruddet), Midtre Havredal, Havredal (Hafredal), Bamble kommune, Telemark fylke, Norge
 
A feldspar quarry in an irregular sunstone (oligoclase)-bearing pegmatite dike about 200 m long and 60 m wide SE of the Midtre Havredal Farm, close to the hill Fløyås. Oligoclase was here mined for glass-production. The quarry follows the pegmatite for about 60 meters.

Mineral List



10 entries listed. 5 valid minerals.

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References

- Andersen, O. (1931): Feltspat II. Forekomster i fylkene Buskerud og Telemark, i flere herreder i Aust-Agder ogi Hidra i Vest-Agder. Norges Geologiske Undersøkelse 128b, p. 15-16.
-Copley, P.A. & Gay, P. (1978): A scanning electron microscope investigation of some Norwegian aventurine feldspars. Norsk Geologisk Tidsskrift. 58, 93-95[samples from Havredal used in this study]
- Copley, P. A. & Gay, P. (1979): Crystallographic studies of some Norwegian aventurinised feldspars by optical, X-ray, and electron optical methods. Norsk Geologisk Tidsskrift, 59: 228-237 [samples from Havredal used in this study]
- Larsen, A. O., Nordrum, F. S. & Austrheim, H. (1999): Turmaliner i Norge. Bergverksmuseets Skrift 15: 21-30 [with an analysis of dravite from this locality]

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