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

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

Albite
var: Oligoclase
'Apatite'
Biotite
Dravite
'Feldspar Group
var: Sunstone'

Hematite
Kyanite
'Monazite'
Muscovite


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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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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